diff --git a/hydro/handler/contest.js b/hydro/handler/contest.js
index e99797292..5e65c5369 100644
--- a/hydro/handler/contest.js
+++ b/hydro/handler/contest.js
@@ -1,6 +1,6 @@
 const
     { ContestNotLiveError, ValidationError, ProblemNotFoundError,
-        ContestNotAttendedError,ContestScoreboardHiddenError } = require('../error'),
+        ContestNotAttendedError, ContestScoreboardHiddenError } = require('../error'),
     { PERM_VIEW_CONTEST_HIDDEN_SCOREBOARD, PERM_CREATE_CONTEST,
         PERM_EDIT_CONTEST } = require('../permission'),
     { constants } = require('../options'),
@@ -22,7 +22,7 @@ class ContestHandler extends Handler {
         return false;
     }
     canShowScoreboard(tdoc, allowPermOverride = true) {
-        if (contest.RULES[tdoc.rule].showScoreboardFunc(tdoc, new Date())) return true;
+        if (contest.RULES[tdoc.rule].showScoreboard(tdoc, new Date())) return true;
         if (allowPermOverride && this.canViewHiddenScoreboard(tdoc)) return true;
         return false;
     }
@@ -37,12 +37,17 @@ class ContestHandler extends Handler {
         return tdoc, rows, udict;
     }
     async verifyProblems(pids) {
-        let pdocs = await problem.getMulti({ _id: { $in: pids } }).sort({ doc_id: 1 }).toArray();
+        console.log(pids);
+        let pdocs = await problem.getMulti({
+            $or: [
+                { _id: { $in: pids } }, { pid: { $in: pids } }
+            ]
+        }).sort({ _id: 1 }).toArray();
         if (pids.length != pdocs.length)
             for (let pid of pids) {
                 let p = false;
                 for (let pdoc of pdocs)
-                    if (pid == pdoc._id) {
+                    if (pid == pdoc._id || pid == pdoc.pid) {
                         p = true;
                         break;
                     }
@@ -105,7 +110,7 @@ class ContestDetailHandler extends ContestHandler {
         };
     }
     async post_attend() {
-        if (contest.isDone(this.tdoc)) throw new ContestNotLiveError(this.tdoc._id);
+        if (contest.is_done(this.tdoc)) throw new ContestNotLiveError(this.tdoc._id);
         await contest.attend(this.tdoc._id, this.uid);
         this.back();
     }
@@ -141,7 +146,7 @@ class ContestEditHandler extends ContestDetailHandler {
         let dt = this.tdoc.beginAt;
         this.response.body = {
             rules, tdoc: this.tdoc, duration, path, pids: this.tdoc.pids.join(','),
-            date_text: `${dt.getFullYear()}-${dt.getMonth()}-${dt.getDate()}`,
+            date_text: `${dt.getFullYear()}-${dt.getMonth() + 1}-${dt.getDate()}`,
             time_text: `${dt.getHours()}:${dt.getMinutes()}`,
             page_name: 'contest_edit'
         };
@@ -149,7 +154,7 @@ class ContestEditHandler extends ContestDetailHandler {
     async post({ beginAtDate, beginAtTime, duration, title, content, rule, pids }) {
         let beginAt, endAt;
         try {
-            beginAt = Date.parse(`${beginAtDate}T${beginAtTime}+8:00`);
+            beginAt = new Date(Date.parse(`${beginAtDate} ${beginAtTime.replace('-', ':')}`));
         } catch (e) {
             throw new ValidationError('beginAtDate', 'beginAtTime');
         }
@@ -237,19 +242,22 @@ class ContestCreateHandler extends ContestHandler {
         let dt = new Date(ts);
         this.response.body = {
             rules, page_name: 'contest_create',
-            date_text: `${dt.getFullYear()}-${dt.getMonth()}-${dt.getDate()}`,
-            time_text: `${dt.getHours()}-${dt.getMinutes()}`,
+            date_text: `${dt.getFullYear()}-${dt.getMonth() + 1}-${dt.getDate()}`,
+            time_text: `${dt.getHours()}:${dt.getMinutes()}`,
             pids: '1000, 1001'
         };
     }
     async post({ title, content, rule, beginAtDate, beginAtTime, duration, pids }) {
         let beginAt, endAt;
+        console.log(beginAtDate, beginAtTime);
         try {
-            beginAt = Date.parse(`${beginAtDate}T${beginAtTime}+8:00`);
+            beginAt = new Date(Date.parse(`${beginAtDate} ${beginAtTime.replace('-', ':')}`));
+            console.log(beginAt, duration);
         } catch (e) {
             throw new ValidationError('beginAtDate', 'beginAtTime');
         }
-        endAt = new Date(beginAt + duration * 3600 * 1000);
+        endAt = new Date(beginAt.getTime() + duration * 3600 * 1000);
+        console.log(endAt);
         if (beginAt >= endAt) throw new ValidationError('duration');
         await this.verifyProblems(pids);
         let tid = await contest.add(title, content, this.user._id, rule, beginAt, endAt, pids);
diff --git a/hydro/handler/problem.js b/hydro/handler/problem.js
index a2889f070..58998e0a9 100644
--- a/hydro/handler/problem.js
+++ b/hydro/handler/problem.js
@@ -52,14 +52,11 @@ class ProblemRandomHandler extends ProblemHandler {
 }
 
 class ProblemDetailHandler extends ProblemHandler {
-    constructor(ctx) {
-        super(ctx);
-        this.uid = ctx.state.user._id;
-        this.pid = ctx.params.pid;
+    async _prepare({ pid }) {
         this.response.template = 'problem_detail.html';
-    }
-    async _prepare() {
-        if (this.pid) this.pdoc = await problem.get(this);
+        this.uid = this.user._id;
+        this.pid = pid;
+        if (pid) this.pdoc = await problem.get(this);
         if (this.pdoc.hidden && this.pdoc.owner != this.uid) this.checkPerm(PERM_VIEW_PROBLEM_HIDDEN);
         if (this.pdoc) this.udoc = await user.getById(this.pdoc.owner);
         this.response.body = {
diff --git a/hydro/lib/misc.js b/hydro/lib/misc.js
index 73f8df49d..d07a4bddc 100644
--- a/hydro/lib/misc.js
+++ b/hydro/lib/misc.js
@@ -2,13 +2,13 @@ const md5 = require('./md5');
 exports.gravatar_url = function (email, size) {
     return `//gravatar.loli.net/avatar/${md5((email || '').toString().trim().toLowerCase())}?d=mm&s=${size}`;
 };
-exports.datetime_span = function (dt, { relative = true } = {}) {
+exports.datetime_span = function (dt, relative = true, format = '%Y-%m-%d %H:%M:%S') {
     if (dt.generationTime) dt = new Date(dt.generationTime * 1000);
     else if (typeof dt == 'number' || typeof dt == 'string') dt = new Date(dt);
     return '<span class="time{0}" data-timestamp="{1}">{2}</span>'.format(
         relative ? ' relative' : '',
         dt.getTime() / 1000,
-        dt.toLocaleString()
+        dt.format(format)
     );
 };
 exports.paginate = function* (page, num_pages) {
diff --git a/hydro/model/contest.js b/hydro/model/contest.js
index bc6eeca4a..4a2a7e5d9 100644
--- a/hydro/model/contest.js
+++ b/hydro/model/contest.js
@@ -12,82 +12,96 @@ const RULES = {
     acm: require('../module/contest/acm')
 };
 
+async function add(title, content, owner, rule,
+    beginAt = new Date(), endAt = new Date(), pids = [], data = {}) {
+    validator.checkTitle(title);
+    validator.checkContent(content);
+    if (!this.RULES[rule]) throw new ValidationError('rule');
+    if (beginAt >= endAt) throw new ValidationError('beginAt', 'endAt');
+    Object.assign(data, { content, owner, title, rule, beginAt, endAt, pids, attend: 0 });
+    this.RULES[rule].check(data);
+    let res = await coll.insertOne(data);
+    return res.insertedId;
+}
+async function edit(tid, $set) {
+    if ($set.title) validator.checkTitle($set.title);
+    if ($set.content) validator.checkIntro($set.content);
+    if ($set.rule)
+        if (!this.RULES[$set.rule]) throw new ValidationError('rule');
+    if ($set.beginAt && $set.endAt)
+        if ($set.beginAt >= $set.endAt) throw new ValidationError('beginAt', 'endAt');
+    let tdoc = await coll.findOne({ tid });
+    if (!tdoc) throw new ContestNotFoundError(tid);
+    this.RULES[$set.rule || tdoc.rule].check(Object.assign(tdoc, $set));
+    await coll.findOneAndUpdate({ tid }, { $set });
+    return tdoc;
+}
+async function get(tid) {
+    let tdoc = await coll.findOne({ _id: tid });
+    if (!tdoc) throw new ContestNotFoundError(tid);
+    return tdoc;
+}
+async function get_random_id(query) {
+    let pdocs = coll.find(query);
+    let pcount = await pdocs.count();
+    if (pcount) {
+        let pdoc = await pdocs.skip(Math.floor(Math.random() * pcount)).limit(1).toArray()[0];
+        return pdoc.pid;
+    } else return null;
+}
+async function getListStatus(uid, tids) {
+    let r = {};
+    for (let tid of tids) r[tid] = await this.getStatus(tid, uid);
+    return r;
+}
+async function attend(tid, uid) {
+    try {
+        await coll_status.insertOne({ tid, uid });
+    } catch (e) {
+        throw new ContestAlreadyAttendedError(tid, uid);
+    }
+    await coll.findOneAndUpdate({ _id: tid }, { $inc: { attend: 1 } });
+}
+function is_new(tdoc, days = 1) {
+    let now = new Date().getTime();
+    let readyAt = tdoc.beginAt.getTime();
+    return (now < readyAt - days * 24 * 3600 * 1000);
+}
+function is_upcoming(tdoc, days = 1) {
+    let now = new Date().getTime();
+    let readyAt = tdoc.beginAt.getTime();
+    return (now > readyAt + days * 24 * 3600 * 1000 && now < tdoc.beginAt);
+}
+function is_not_started(tdoc) {
+    return new Date() < tdoc.beginAt;
+}
+function is_ongoing(tdoc) {
+    let now = new Date();
+    return (tdoc.beginAt <= now && now < tdoc.endAt);
+}
+function is_done(tdoc) {
+    return tdoc.endAt <= new Date();
+}
 module.exports = {
-    RULES,
-    async add(title, content, owner, rule,
-        beginAt = new Date(), endAt = new Date(), pids = [], data) {
-        validator.checkTitle(title);
-        validator.checkContent(content);
-        if (!this.RULES[rule]) throw new ValidationError('rule');
-        if (beginAt >= endAt) throw new ValidationError('beginAt', 'endAt');
-        Object.assign(data, { content, owner, title, rule, beginAt, endAt, pids, attend: 0 });
-        this.RULES[rule].check(data);
-        return await coll.insertOne(data);
-    },
+    RULES, add, getListStatus, attend, edit, get, get_random_id,
     count: query => coll.find(query).count(),
-    async edit(tid, $set) {
-        if ($set.title) validator.checkTitle($set.title);
-        if ($set.content) validator.checkIntro($set.content);
-        if ($set.rule)
-            if (!this.RULES[$set.rule]) throw new ValidationError('rule');
-        if ($set.beginAt && $set.endAt)
-            if ($set.beginAt >= $set.endAt) throw new ValidationError('beginAt', 'endAt');
-        let tdoc = await coll.findOne({ tid });
-        if (!tdoc) throw new ContestNotFoundError(tid);
-        this.RULES[$set.rule || tdoc.rule].check(Object.assign(tdoc, $set));
-        await coll.findOneAndUpdate({ tid }, { $set });
-        return tdoc;
-    },
-    async get(tid) {
-        let tdoc = await coll.findOne({ tid });
-        if (!tdoc) throw new ContestNotFoundError(tid);
-        return tdoc;
-    },
     getMulti: query => coll.find(query),
     getMultiStatus: query => coll_status.find(query),
-    async get_random_id(query) {
-        let pdocs = coll.find(query);
-        let pcount = await pdocs.count();
-        if (pcount) {
-            let pdoc = await pdocs.skip(Math.floor(Math.random() * pcount)).limit(1).toArray()[0];
-            return pdoc.pid;
-        } else return null;
-    },
     getStatus: (tid, uid) => coll_status.findOne({ tid, uid }),
     setStatus: (tid, uid, $set) => coll_status.findOneAndUpdate({ tid, uid }, { $set }),
-    async getListStatus(uid, tids) {
-        let r = {};
-        for (let tid of tids) r[tid] = await this.getStatus(tid, uid);
-        return r;
-    },
-    is_new(tdoc, days = 1) {
-        let now = new Date().getTime();
-        let readyAt = tdoc.beginAt.getTime();
-        return (now < readyAt - days * 24 * 3600 * 1000);
-    },
-    is_upcoming(tdoc, days = 1) {
-        let now = new Date().getTime();
-        let readyAt = tdoc.beginAt.getTime();
-        return (now > readyAt + days * 24 * 3600 * 1000 && now < tdoc.beginAt);
-    },
-    is_not_started: tdoc => new Date() < tdoc.beginAt,
-    is_ongoing(tdoc) {
-        let now = new Date();
-        return (tdoc.beginAt <= now && now < tdoc.endAt);
-    },
-    is_done: tdoc => tdoc.endAt <= new Date(),
+    is_new, is_upcoming, is_not_started, is_ongoing, is_done,
     status_text: tdoc =>
-        this.is_new(tdoc)
+        is_new(tdoc)
             ? 'New'
-            : this.is_upcoming(tdoc)
+            : is_upcoming(tdoc)
                 ? 'Ready (☆▽☆)'
-                : this.is_ongoing(tdoc)
+                : is_ongoing(tdoc)
                     ? 'Live...'
                     : 'Done',
     get_status: tdoc =>
-        this.is_not_started(tdoc)
+        is_not_started(tdoc)
             ? 'not_started'
-            : this.is_ongoing(tdoc)
+            : is_ongoing(tdoc)
                 ? 'ongoing'
                 : 'finished',
 };
diff --git a/hydro/model/problem.js b/hydro/model/problem.js
index 6a7afeb68..7f48f6b17 100644
--- a/hydro/model/problem.js
+++ b/hydro/model/problem.js
@@ -85,6 +85,11 @@ async function random(query) {
         return pdoc.pid;
     } else return null;
 }
+async function getList(pids) {
+    let r = {};
+    for (let pid of pids) r[pid] = await get({pid});
+    return r;
+}
 
 module.exports = {
     add,
@@ -94,5 +99,6 @@ module.exports = {
     count,
     random,
     getById,
-    getMulti
+    getMulti,
+    getList
 };
\ No newline at end of file
diff --git a/hydro/module/contest/oi.js b/hydro/module/contest/oi.js
index 1a4c8c402..6ee27cd7c 100644
--- a/hydro/module/contest/oi.js
+++ b/hydro/module/contest/oi.js
@@ -10,6 +10,9 @@ module.exports = {
             }
         return { score, detail };
     },
+    showScoreboard(tdoc,now){
+        return now>tdoc.endAt; 
+    },
     scoreboard(is_export, _, tdoc, ranked_tsdocs, udict, dudict, pdict) {
         let columns = [
             { type: 'rank', value: _('Rank') },
diff --git a/hydro/service/server.js b/hydro/service/server.js
index 212b2a4d6..5e866f835 100644
--- a/hydro/service/server.js
+++ b/hydro/service/server.js
@@ -13,8 +13,7 @@ const
     blacklist = require('../model/blacklist'),
     token = require('../model/token'),
     opcount = require('../model/opcount'),
-    { UserNotFoundError, BlacklistedError, PermissionError,
-        NotFoundError } = require('../error');
+    { UserNotFoundError, BlacklistedError, PermissionError } = require('../error');
 
 const options = require('../options');
 let http = options.listen.https ? require('https') : require('http');
@@ -128,40 +127,33 @@ class Handler {
     async ___cleanup() {
         try {
             await this.renderBody();
-        } catch (e) {
-            try {
-                let error;
-                if (this.response.body && this.response.body.error) error = this.response.body.error;
-                else error = e;
-                if (error instanceof NotFoundError) this.response.status = 404;
-                if (error.name == 'Template render error') throw error;
-                if (this.preferJson) this.response.body = { error };
-                else await this.render('error.html', { error });
-            } catch (error) {
-                if (this.preferJson) this.response.body = { error };
-                else await this.render('bsod.html', { error });
-            }
+        } catch (error) {
+            if (this.preferJson) this.response.body = { error };
+            else await this.render('bsod.html', { error });
         }
         await this.putResponse();
         await this.saveCookie();
     }
     async renderBody() {
-        if (this.response.body || this.response.template) {
-            if (this.request.query.noTemplate || this.preferJson) return;
-            if (this.request.query.template || this.response.template) {
-                this.response.body = this.response.body || {};
-                await this.render(this.request.query.template || this.response.template, this.response.body);
+        if (!this.preferJson)
+            if (this.response.body || this.response.template) {
+                if (this.request.query.noTemplate || this.preferJson) return;
+                if (this.request.query.template || this.response.template) {
+                    this.response.body = this.response.body || {};
+                    await this.render(this.request.query.template || this.response.template, this.response.body);
+                }
             }
-        }
     }
     async putResponse() {
-        if (this.response.redirect) {
-            this.response.type = 'application/octet-stream';
-            this.redirect(this.response.redirect);
+        if (this.response.redirect && !this.preferJson) {
+            this.ctx.response.type = 'application/octet-stream';
+            this.ctx.response.status = 302;
+            this.ctx.redirect(this.response.redirect);
+        } else {
+            if (this.response.body) this.ctx.body = this.response.body;
+            if (this.response.type) this.ctx.response.type = this.response.type;
+            if (this.response.status) this.ctx.response.status = this.response.status;
         }
-        if (this.response.body) this.ctx.body = this.response.body;
-        if (this.response.type) this.ctx.response.type = this.response.type;
-        if (this.response.status) this.ctx.response.status = this.response.status;
     }
     async saveCookie() {
         if (this.session.sid)
@@ -184,9 +176,11 @@ class Handler {
         }
         this.ctx.cookies.set('sid', this.session.sid, cookie);
     }
-    async onerror(e) {
-        console.error(e.message, e.params);
-        console.error(e.stack);
+    async onerror(error) {
+        console.error(error.message, error.params);
+        console.error(error.stack);
+        this.response.template = 'error.html';
+        this.response.body = { error };
         await this.___cleanup();
     }
 }
@@ -203,6 +197,8 @@ function Route(route, handler) {
             if (args.page) args.page = parseInt(args.page);
             if (args.rid) args.rid = new ObjectID(args.rid);
             if (args.tid) args.tid = new ObjectID(args.tid);
+            if (args.duration) args.duration = parseFloat(args.duration);
+            if (args.pids) args.pids = args.pids.split(',').map(i => i.trim());
 
             if (h.___prepare) await h.___prepare(args);
             if (h.__prepare) await h.__prepare(args);
@@ -330,6 +326,7 @@ exports.Connection = Connection;
 exports.start = function start() {
     app.use(morgan(':method :url :status :res[content-length] - :response-time ms'));
     app.use(router.routes()).use(router.allowedMethods());
+    Route('*', Handler);
     server.listen(options.listen.port);
     console.log('Server listening at: %s', options.listen.port);
 };
diff --git a/hydro/utils.js b/hydro/utils.js
index 7f8e38e7e..27a0d19c6 100644
--- a/hydro/utils.js
+++ b/hydro/utils.js
@@ -27,3 +27,14 @@ Array.isDiff = function isDiff(a, b) {
         if (a[i] != b[i]) return true;
     return false;
 };
+
+Date.prototype.format = function (fmt = '%Y-%m-%d %H:%M:%S') {
+    return fmt
+        .replace('%Y', this.getFullYear())
+        .replace('%m', this.getMonth() + 1)
+        .replace('%D', this.getDate())
+        .replace('%d', this.getDate())
+        .replace('%H', this.getHours())
+        .replace('%M', this.getMinutes())
+        .replace('%S', this.getSeconds());
+};
diff --git a/templates/components/contest.html b/templates/components/contest.html
index 5faf27d95..1f8234b71 100644
--- a/templates/components/contest.html
+++ b/templates/components/contest.html
@@ -1,8 +1,8 @@
 {% import "components/user.html" as user with context %}
 {% macro render_time(tdoc_time) %}
-{{ datetime_span(tdoc_time, false, '%Y-%m-%d %H:%M') }}
+{{ datetime_span(tdoc_time, false, '%Y-%m-%d %H:%M')|safe }}
 {% endmacro %}
 
 {% macro render_duration(tdoc) %}
-{{ ((tdoc['end_at'] - tdoc['begin_at']).total_seconds() / 3600)|round(1) }}
+{{ ((tdoc.endAt.getTime() - tdoc.beginAt.getTime()) /1000 / 3600)|round(1) }}
 {% endmacro %}
diff --git a/templates/contest_detail.html b/templates/contest_detail.html
index 23755862b..c83e39847 100644
--- a/templates/contest_detail.html
+++ b/templates/contest_detail.html
@@ -1,3 +1,4 @@
+{% set page_name = "contest_detail" %}
 {% extends "layout/basic.html" %}
 {% import "components/contest.html" as contest with context %}
 {% import "components/record.html" as record with context %}
@@ -7,20 +8,20 @@
   <div class="medium-9 columns">
     <div class="section">
       <div class="section__body typo">
-        {{ tdoc['content']|markdown }}
-      {% if handler.is_ongoing(tdoc) %}
+        {{ tdoc['content']|markdown|safe }}
+      {% if model.contest.is_ongoing(tdoc) %}
         <blockquote class="warn">
           <p>{{ _('We will check code similarity after this contest.') }}</p>
         </blockquote>
       {% endif %}
       </div>
     </div>
-  {% if handler.is_ongoing(tdoc) or handler.is_done(tdoc) %}
+  {% if model.contest.is_ongoing(tdoc) or model.contest.is_done(tdoc) %}
     <div class="section">
       <div class="section__header">
         <h1 class="section__title">{{ _('Problem') }}</h1>
       </div>
-    {% if attended or handler.is_done(tdoc) %}
+    {% if attended or model.contest.is_done(tdoc) %}
       <div class="section__body no-padding">
         <table class="data-table">
           <colgroup>
@@ -40,18 +41,17 @@
             </tr>
           </thead>
           <tbody>
-          {% for pid in tdoc['pids'] %}
+          {% for pid in tdoc.pids %}
             <tr>
             {% if handler.hasPerm(perm.PERM_LOGGEDIN) %}
-              {% if psdict[pid] and psdict[pid]['rid'] %}
-              {% with rdoc=rdict[psdict[pid]['rid']] %}
+              {% if psdict[pid] and psdict[pid].rid %}
+              {% set rdoc = rdict[psdict[pid].rid] %}
               {% if handler.can_show_record(tdoc) %}
                 {{ record.render_status_td(rdoc) }}
               {% else %}
                 <td class="col--status record-status--border"><a href="/r/{{ rdoc._id }}">{{ _('Submitted') }}</a></td>
               {% endif %}
-                <td class="col--submit-at">{{ datetime_span(rdoc['_id'].generationTime) }}</td>
-              {% endwith %}
+                <td class="col--submit-at">{{ datetime_span(rdoc._id) }}</td>
               {% else %}
                 <td class="col--status record-status--border">{{ _('No Submissions') }}</td>
                 <td class="col--submit-at">-</td>
@@ -73,9 +73,8 @@
   {% endif %}
   </div>
   <div class="medium-3 columns">
-  {% with owner_udoc=udict[tdoc['owner_uid']], owner_dudoc=dudict[tdoc['owner_uid']] %}
-    {% include "partials/contest_sidebar.html" %}
-  {% endwith %}
+  {% set owner_udoc = udict[tdoc.owner] %}
+  {% include "partials/contest_sidebar.html" %}
   </div>
 </div>
 {% endblock %}
diff --git a/templates/contest_main.html b/templates/contest_main.html
index a28e053cf..0a20e824e 100644
--- a/templates/contest_main.html
+++ b/templates/contest_main.html
@@ -17,11 +17,11 @@
           </li>
           <li>
             <span class="icon icon-calendar"></span>
-            {{ _('Start at') }}: {{ model.contest.render_time(tdoc['beginAt']) }}
+            {{ _('Start at') }}: {{ contest.render_time(tdoc.beginAt) }}
           </li>
           <li>
             <span class="icon icon-schedule--fill"></span>
-            {{ _('Duration') }}: {{ model.contest.render_duration(tdoc) }} {{ _('hour(s)') }}
+            {{ _('Duration') }}: {{ contest.render_duration(tdoc) }} {{ _('hour(s)') }}
           </li>
           <li>
             <span class="icon icon-user--multiple"></span>
@@ -32,7 +32,7 @@
     </div>
     <div class="media__right middle">
       <div class="section__body">
-        <a href="/t/{{ tdoc._id }}" class="detail-button">{{ _('View Details') }}</a>
+        <a href="/c/{{ tdoc._id }}" class="detail-button">{{ _('View Details') }}</a>
         <div class="typo text-center">
         {% if tsdict[tdoc._id].attend %}
           <p><span class="icon icon-check"></span> {{ _('Attended') }}</p>
@@ -49,9 +49,9 @@
 <div class="row">
   <div class="medium-9 columns">
   {% for tdoc in tdocs %}
-  {% if handler.is_ongoing(tdoc) %}
+  {% if model.contest.is_ongoing(tdoc) %}
     {{ render_important_contest('live', 'Live...', tdoc) }}
-  {% elif handler.is_upcoming(tdoc) %}
+  {% elif model.contest.is_upcoming(tdoc) %}
     {{ render_important_contest('ready', 'Ready (☆▽☆)', tdoc) }}
   {% endif %}
   {% endfor %}
@@ -83,12 +83,12 @@
             <div class="media">
               <div class="media__left medium">
                 <div class="contest__date numbox">
-                  <div class="numbox__num large">{{ datetime_span(tdoc['beginAt'], false, '%d') }}</div>
-                  <div class="numbox__text">{{ datetime_span(tdoc['beginAt'], false, '%Y-%m') }}</div>
+                  <div class="numbox__num large">{{ datetime_span(tdoc['beginAt'], false, '%d')|safe }}</div>
+                  <div class="numbox__text">{{ datetime_span(tdoc['beginAt'], false, '%Y-%m')|safe }}</div>
                 </div>
               </div>
               <div class="media__body medium">
-                <h1 class="contest__title"><a href="/t/{{ tdoc._id }}" data-emoji-enabled>{{ tdoc['title'] }}</a></h1>
+                <h1 class="contest__title"><a href="/c/{{ tdoc._id }}" data-emoji-enabled>{{ tdoc['title'] }}</a></h1>
                 <ul class="supplementary list">
                   <li>
                     <a href="?rule={{ tdoc['rule'] }}" class="contest-type-tag"><span class="icon icon-award"></span>{{ model.contest.RULES[tdoc.rule].TEXT }}</a>
diff --git a/templates/domain_main.html b/templates/domain_main.html
index 22b0ce30c..404631c87 100644
--- a/templates/domain_main.html
+++ b/templates/domain_main.html
@@ -33,7 +33,7 @@
               </div>
             </div>
             <div class="media__body medium">
-              <h1 class="contest__title"><a href="/t/{{ tdoc._id }}" data-emoji-enabled>{{ tdoc['title'] }}</a></h1>
+              <h1 class="contest__title"><a href="/c/{{ tdoc._id }}" data-emoji-enabled>{{ tdoc['title'] }}</a></h1>
               <ul class="supplementary list">
                 <li>
                   <a href="{{ reverse_url('contest_main') }}?rule={{ tdoc['rule'] }}" class="contest-type-tag"><span class="icon icon-award"></span>{{ vj4.constant.contest.RULE_TEXTS[tdoc['rule']] }}</a>
diff --git a/templates/error.html b/templates/error.html
index 8bedf5b45..544d5b9ab 100644
--- a/templates/error.html
+++ b/templates/error.html
@@ -8,13 +8,13 @@
   </div>
   <div class="error__text-container">
     <h1>{{ _('Oops!') }}</h1>
-    <p>{{ _(error.message).format(error.args) }}</p>
+    <p>{{ _(error.message).format(error.params) }}</p>
     <p>{{ _('Technical Information') }}:</p>
     <p>{{ _('Type') }}: {{ error.code }}</p>
     <p>{{ _('Arguments') }}:
       <ol>
-      {% for arg in error.args %}
-        <li>{{ arg }}</li>
+      {% for param in error.params %}
+        <li>{{ param }}</li>
       {% endfor %}
       </ol>
     </p>
diff --git a/templates/partials/contest_sidebar.html b/templates/partials/contest_sidebar.html
index d1c2e159c..eca9aa107 100644
--- a/templates/partials/contest_sidebar.html
+++ b/templates/partials/contest_sidebar.html
@@ -2,7 +2,7 @@
 {% import "components/contest.html" as contest with context %}
 <div class="section side">
 {% if page_name != 'contest_detail' %}
-  <a class="contest-sidebar__bg" href="/t/{{ tdoc._id }}">
+  <a class="contest-sidebar__bg" href="/c/{{ tdoc._id }}">
     <div class="section__body">
       <h1>{{ tdoc['title'] }}</h1>
       <div class="contest-sidebar__status">
@@ -17,31 +17,15 @@
 {% endif %}
   <div>
     <ol class="menu">
-    {% if page_name == 'discussion_node' %}
-    {% if handler.hasPerm(perm.PERM_CREATE_DISCUSSION) %}
-      <li class="menu__item"><a class="menu__link highlight" href="{{ reverse_url('discussion_create_document_as_node', doc_type=tdoc['doc_type'], doc_id=tdoc['doc_id']) }}">
-        <span class="icon icon-add"></span> {{ _('Create a Discussion') }}
-      </a></li>
-    {% else %}
-      {% if not handler.hasPerm(perm.PERM_LOGGEDIN) %}
-        <li class="menu__item"><a class="menu__link" href="javascript:showSignInDialog();">
-        <span class="icon icon-add"></span> {{ _('Login to Create a Discussion') }}</a></li>
-      {% else %}
-        <li class="menu__item"><a class="menu__link disabled" href="javascript:;">
-        <span class="icon icon-add"></span> {{ _('No Permission to Create a Discussion') }}</a></li>
-      {% endif %}
-    {% endif %}
-      <li class="menu__seperator"></li>
-    {% endif %}
     {% if page_name != 'contest_detail' %}
-      <li class="menu__item"><a class="menu__link" href="/t/{{ tdoc._id }}">
+      <li class="menu__item"><a class="menu__link" href="/c/{{ tdoc._id }}">
         <span class="icon icon-award"></span> {{ _('View Contest') }}
       </a></li>
     {% endif %}
-    {% if not attended and not handler.is_done(tdoc) %}
+    {% if not attended and not model.contest.is_done(tdoc) %}
       <li class="menu__item">
     {% if handler.hasPerm(perm.PERM_ATTEND_CONTEST) and handler.hasPerm(perm.PERM_LOGGEDIN) %}
-        <form action="/t/{{ tdoc._id }}" method="POST">
+        <form action="/c/{{ tdoc._id }}" method="POST">
           <input type="hidden" name="operation" value="attend">
           <input type="hidden" name="csrf_token" value="{{ handler.csrf_token }}">
           <button class="menu__link" type="submit">
@@ -59,26 +43,26 @@
     {% endif %}
       </li>
     {% endif %}
-    {% if handler.can_show_scoreboard(tdoc, False) %}
-      <li class="menu__item"><a class="menu__link" href="{{ reverse_url('contest_scoreboard', tid=tdoc['doc_id']) }}">
+    {% if handler.canShowScoreboard(tdoc, False) %}
+      <li class="menu__item"><a class="menu__link" href="/c/{{ tdoc._id }}/scoreboard">
         <span class="icon icon-statistics"></span> {{ _('Scoreboard') }}
       </a></li>
-    {% elif handler.can_view_hidden_scoreboard(tdoc) %}
-      <li class="menu__item"><a class="menu__link" href="{{ reverse_url('contest_scoreboard', tid=tdoc['doc_id']) }}">
+    {% elif handler.canViewHiddenScoreboard(tdoc) %}
+      <li class="menu__item"><a class="menu__link" href="/c/{{ tdoc._id }}/scoreboard">
         <span class="icon icon-statistics"></span> {{ _('Scoreboard (Hidden)') }}
       </a></li>
     {% endif %}
-    {% if handler.own(tdoc, perm.PERM_EDIT_CONTEST_SELF) or handler.hasPerm(perm.PERM_EDIT_CONTEST) %}
-      <li class="menu__item"><a class="menu__link" href="{{ reverse_url('contest_edit', tid=tdoc['doc_id']) }}">
+    {% if user._id == tdoc.owner or handler.hasPerm(perm.PERM_EDIT_CONTEST) %}
+      <li class="menu__item"><a class="menu__link" href="/c/{{ tdoc._id }}/edit">
         <span class="icon icon-edit"></span>  {{ _('Edit Contest') }}
       </a></li>
     {% endif %}
     {% if handler.hasPerm(perm.PERM_READ_RECORD_CODE) %}
-      <li class="menu__item"><a class="menu__link" href="{{ reverse_url('contest_code', tid=tdoc['doc_id']) }}">
+      <li class="menu__item"><a class="menu__link" href="/c/{{ tdoc._id }}/code">
         <span class="icon icon-download"></span> {{ _('Export All Code') }}
       </a></li>
     {% endif %}
-      <li class="menu__item"><a class="menu__link" href="/r?tid={{ tdoc['doc_id'] }}">
+      <li class="menu__item"><a class="menu__link" href="/r?tid={{ tdoc._id }}">
         <span class="icon icon-flag"></span> {{ _('All Submissions') }}
       </a></li>
       <li class="menu__item"><a class="menu__link" href="/wiki/help#contest">
@@ -89,13 +73,13 @@
   </div>
   <div class="section__body typo">
     <dl class="large horizontal">
-      <dt>{{ _('Status') }}</dt><dd>{{ _(handler.status_text(tdoc)) }}</dd>
-      <dt>{{ _('Rule') }}</dt><dd>{{ vj4.constant.contest.RULE_TEXTS[tdoc['rule']] }}</dd>
-      <dt>{{ _('Problem') }}</dt><dd>{{ tdoc['pids']|length }}</dd>
-      <dt>{{ _('Start at') }}</dt><dd>{{ contest.render_time(tdoc['begin_at']) }}</dd>
-      <dt>{{ _('End at') }}</dt><dd>{{ contest.render_time(tdoc['end_at']) }}</dd>
+      <dt>{{ _('Status') }}</dt><dd>{{ _(model.contest.status_text(tdoc)) }}</dd>
+      <dt>{{ _('Rule') }}</dt><dd>{{ model.contest.RULES[tdoc.rule].TEXT }}</dd>
+      <dt>{{ _('Problem') }}</dt><dd>{{ tdoc.pids.length }}</dd>
+      <dt>{{ _('Start at') }}</dt><dd>{{ contest.render_time(tdoc.beginAt) }}</dd>
+      <dt>{{ _('End at') }}</dt><dd>{{ contest.render_time(tdoc.endAt) }}</dd>
       <dt>{{ _('Duration') }}</dt><dd>{{ contest.render_duration(tdoc) }} {{ _('hour(s)') }}</dd>
-      <dt>{{ _('Host') }}</dt><dd>{{ user.render_inline(owner_udoc, dudoc=owner_dudoc, badge=false) }}</dd>
+      <dt>{{ _('Host') }}</dt><dd>{{ user.render_inline(owner_udoc, badge=false) }}</dd>
       <dt>{{ _('Partic.') }}</dt>
       <dd>
         {{ tdoc['attend']|default(0) }}
diff --git a/templates/partials/problem_sidebar_normal.html b/templates/partials/problem_sidebar_normal.html
index 9feeaedaf..d9c31fa09 100644
--- a/templates/partials/problem_sidebar_normal.html
+++ b/templates/partials/problem_sidebar_normal.html
@@ -174,7 +174,7 @@
   {% if ctdocs %}
     <p>{{ _('In following contests') }}: </p>
     {% for tdoc in ctdocs %}
-    <p><a href="/t/{{ tdoc._id }}">{{ tdoc['title'] }}</a></p>
+    <p><a href="/c/{{ tdoc._id }}">{{ tdoc['title'] }}</a></p>
     {% endfor %}
   {% endif %}
   {% if htdocs %}
diff --git a/templates/record_detail.html b/templates/record_detail.html
index c833a294d..bdc717890 100644
--- a/templates/record_detail.html
+++ b/templates/record_detail.html
@@ -67,7 +67,7 @@
         {% if tdoc['doc_type'] == vj4.model.document.TYPE_CONTEST %}
           <dt>{{ _('Contest') }}</dt>
           <dd>
-            <a href="/t/{{ tdoc._id }}">{{ tdoc['title'] }}</a>
+            <a href="/c/{{ tdoc._id }}">{{ tdoc['title'] }}</a>
           </dd>
         {% else %}{# tdoc['doc_type'] == vj4.model.document.TYPE_CONTEST #}
           <dt>{{ _('Homework') }}</dt>