diff --git a/chat-plugins/tcgtabletop.js b/chat-plugins/tcgtabletop.js
index 860d667fa2..34b71da97a 100644
--- a/chat-plugins/tcgtabletop.js
+++ b/chat-plugins/tcgtabletop.js
@@ -8,6 +8,8 @@
 
 const http = require('http');
 
+function noop() {}
+
 function wikiaSearch(subdomain, query, callback) {
 	http.get('http://' + subdomain + '.wikia.com/api/v1/Search/List/?query=' + encodeURIComponent(query) + '&limit=1', res => {
 		let buffer = '';
@@ -28,7 +30,10 @@ function wikiaSearch(subdomain, query, callback) {
 
 			return callback(null, result.items[0]);
 		});
-	}).on('error', callback);
+	}).once('error', function (err) {
+		callback(err);
+		this.on('error', noop);
+	});
 }
 
 exports.commands = {
@@ -42,7 +47,7 @@ exports.commands = {
 		let subdomain = (cmd === 'yugioh' || cmd === 'ygo') ? 'yugioh' : 'mtg';
 		let query = target.trim();
 
-		wikiaSearch(subdomain, query, ((err, data) => {
+		wikiaSearch(subdomain, query, (err, data) => {
 			if (err) {
 				if (err instanceof SyntaxError || err.message === 'Malformed data') {
 					if (!broadcasting) return connection.sendTo(room, "Error: something went wrong in the request: " + err.message);
@@ -56,6 +61,6 @@ exports.commands = {
 			let htmlReply = "<strong>Best result for " + Tools.escapeHTML(query) + ":</strong><br/><a href=\"" + Tools.escapeHTML(entryUrl) + "\">" + Tools.escapeHTML(entryTitle) + "</a>";
 			if (!broadcasting) return connection.sendTo(room, "|raw|<div class=\"infobox\">" + htmlReply + "</div>");
 			room.addRaw("<div class=\"infobox\">" + htmlReply + "</div>").update();
-		}).once());
+		});
 	},
 };
diff --git a/commands.js b/commands.js
index c1656d051c..e3e56b9b7a 100644
--- a/commands.js
+++ b/commands.js
@@ -1842,8 +1842,8 @@ exports.commands = {
 				let bracketIndex = line.indexOf(']');
 				let parenIndex = line.indexOf(')');
 				if (bracketIndex < 0) return Tools.escapeHTML(line);
-				let time = line.slice(1, bracketIndex);
-				let timestamp = new Date(time).format('{yyyy}-{MM}-{dd} {hh}:{mm}{tt}');
+				const time = line.slice(1, bracketIndex);
+				let timestamp = Tools.toTimeStamp(new Date(time), {hour12: true});
 				parenIndex = line.indexOf(')');
 				let roomid = line.slice(bracketIndex + 3, parenIndex);
 				if (!hideIps && Config.modloglink) {
diff --git a/loginserver.js b/loginserver.js
index d1d3d2a3c2..8a086dc76a 100644
--- a/loginserver.js
+++ b/loginserver.js
@@ -142,7 +142,11 @@ class LoginServerInstance {
 		};
 
 		let req = null;
-		let onReqError = (error => {
+
+		let hadError = false;
+		let onReqError = error => {
+			if (hadError) return;
+			hadError = true;
 			if (this.requestTimeoutTimer) {
 				clearTimeout(this.requestTimeoutTimer);
 				this.requestTimeoutTimer = null;
@@ -152,7 +156,7 @@ class LoginServerInstance {
 				setImmediate(requestCallbacks[i], null, null, error);
 			}
 			this.requestEnd(error);
-		}).once();
+		};
 
 		req = http.request(requestOptions, res => {
 			if (this.requestTimeoutTimer) {
@@ -166,7 +170,10 @@ class LoginServerInstance {
 				buffer += chunk;
 			});
 
-			let endReq = (() => {
+			let requestEnded = false;
+			let endReq = () => {
+				if (requestEnded) return;
+				requestEnded = true;
 				if (this.requestTimeoutTimer) {
 					clearTimeout(this.requestTimeoutTimer);
 					this.requestTimeoutTimer = null;
@@ -181,7 +188,7 @@ class LoginServerInstance {
 					}
 				}
 				this.requestEnd();
-			}).once();
+			};
 			res.on('end', endReq);
 			res.on('close', endReq);
 
diff --git a/rooms.js b/rooms.js
index 4cbe2f33e5..6a76ad4df5 100644
--- a/rooms.js
+++ b/rooms.js
@@ -1005,9 +1005,10 @@ let BattleRoom = (() => {
 		logData.endType = this.battle.endType;
 		if (!p1rating) logData.ladderError = true;
 		logData.log = BattleRoom.prototype.getLog.call(logData, 3); // replay log (exact damage)
-		let date = new Date();
-		let logfolder = date.format('{yyyy}-{MM}');
-		let logsubfolder = date.format('{yyyy}-{MM}-{dd}');
+		const date = new Date();
+		const logsubfolder = Tools.toTimeStamp(date).split(' ')[0];
+		const logfolder = logsubfolder.split('-', 2).join('-');
+
 		let curpath = 'logs/' + logfolder;
 		fs.mkdir(curpath, '0755', () => {
 			let tier = this.format.toLowerCase().replace(/[^a-z0-9]+/g, '');
@@ -1333,7 +1334,7 @@ let ChatRoom = (() => {
 		if (Config.logchat) {
 			this.rollLogFile(true);
 			this.logEntry = function (entry, date) {
-				let timestamp = (new Date()).format('{HH}:{mm}:{ss} ');
+				const timestamp = Tools.toTimeStamp(new Date()).split(' ')[1] + ' ';
 				entry = entry.replace(/<img[^>]* src="data:image\/png;base64,[^">]+"[^>]*>/g, '');
 				this.logFile.write(timestamp + entry + '\n');
 			};
@@ -1372,10 +1373,11 @@ let ChatRoom = (() => {
 		let date = new Date();
 		let basepath = 'logs/chat/' + this.id + '/';
 		mkdir(basepath, '0755', () => {
-			let path = date.format('{yyyy}-{MM}');
+			const dateString = Tools.toTimeStamp(date).split(' ')[0];
+			let path = dateString.split('-', 2).join('-');
 			mkdir(basepath + path, '0755', () => {
 				if (this.destroyingLog) return;
-				path += '/' + date.format('{yyyy}-{MM}-{dd}') + '.txt';
+				path += '/' + dateString + '.txt';
 				if (path !== this.logFilename) {
 					this.logFilename = path;
 					if (this.logFile) this.logFile.destroySoon();
@@ -1394,9 +1396,9 @@ let ChatRoom = (() => {
 						} catch (e) {} // OS doesn't support atomic rename
 					} catch (e) {} // OS doesn't support symlinks
 				}
-				let timestamp = +date;
-				date.advance('1 hour').reset('minutes').advance('1 second');
-				setTimeout(() => this.rollLogFile(), +date - timestamp);
+				let currentTime = date.getTime();
+				let nextHour = new Date(date.setMinutes(60)).setSeconds(1);
+				setTimeout(() => this.rollLogFile(), nextHour - currentTime);
 			});
 		});
 	};
diff --git a/tools.js b/tools.js
index ff9fc5a63d..b1865a8555 100644
--- a/tools.js
+++ b/tools.js
@@ -691,6 +691,19 @@ module.exports = (() => {
 		return ('' + str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&apos;').replace(/\//g, '&#x2f;');
 	};
 
+	Tools.prototype.toTimeStamp = function (date, options) {
+		// Return a timestamp in the form {yyyy}-{MM}-{dd} {hh}:{mm}:{ss}.
+		// Optionally reports hours in mod-12 format.
+		const isHour12 = options && options.hour12;
+		let parts = [date.getFullYear(), date.getMonth() + 1, date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds()];
+		if (isHour12) {
+			parts.push(parts[3] >= 12 ? 'pm' : 'am');
+			parts[3] = parts[3] % 12 || 12;
+		}
+		parts = parts.map(val => val < 10 ? '0' + val : '' + val);
+		return parts.slice(0, 3).join("-") + " " + parts.slice(3, 6).join(":") + (isHour12 ? " " + parts[6] : "");
+	};
+
 	Tools.prototype.toDurationString = function (number) {
 		// TODO: replace by Intl.DurationFormat or equivalent when it becomes available (ECMA-402)
 		// https://github.com/tc39/ecma402/issues/47