server-time Extension

Copyright © 2012 Stéphan Kochen <>

Copyright © 2012 Alexey Sokolov <>

Copyright © 2012 Kyle Fuller <>

Copyright © 2016 James Wheare <>

Unlimited redistribution and modification of this document is allowed provided that the above copyright notice and this permission notice remains intact.

Description 🔗

Clients indicate support for the extension by requesting a capability server-time as per the IRC Client Capabilities Extension.

CAP REQ :server-time

When enabled, the server-time extension enables optional time message tag which can be used in messages from server to client. The value of the tag MUST have the following syntax:

<value> ::= YYYY-MM-DDThh:mm:ss.sssZ

It represents a calendar date and time of day in UTC using extended format, as specified by ISO 8601:2004(E) 4.3.2. Precision of the time is one millisecond.

If the time is presented in a message received from a server, a client SHOULD treat the message as having occurred at the given time instead of its current time.

Servers MAY include the timestamp in messages when they see fit but MUST NOT do so before acknowledging the client capability using CAP ACK. Clients MAY choose to simplify parsing by accepting timestamps at any point in the connection (e.g. even before CAP REQ).

Servers offering this capability for all messages SHOULD also offer the echo-message capability to allow clients to keep a consistent chronology of events.

Examples 🔗

This section is non-normative

Angel messaged Wiz at Wed, 19 Oct 2011 16:40:51.620 UTC

@time=2011-10-19T16:40:51.620Z :Angel! PRIVMSG Wiz :Hello

John joined #chan during the leap second of June 2012 (notice the :60)

@time=2012-06-30T23:59:60.419Z :John!~john@ JOIN #chan

Errata 🔗

Previous versions of the specification didn’t recommend echo-message

Software supporting server-time: Ergo, InspIRCd, Planio Team Chat, Solanum, txircd, UnrealIRCd, AdiIRC, Ambassador, catgirl, Colloquy, Glirc, Halloy, HexChat, IceChat, Irssi, Konversation, KVIrc, mIRC, Mozilla Thunderbird, Quassel, senpai, Srain, Swirc, Textual, WeeChat, gamja, IRCCloud, Kiwi IRC, The Lounge, web client, CoreIRC, Palaver, Quasseldroid, Goguma, IRCCloud (as Server), KiwiBNC (as Server), KiwiBNC (as Client), pounce (as Server), pounce (as Client), soju (as Server), soju (as Client), ZNC (as Server), ZNC (as Client), BitBot, Eggdrop, Limnoria, Moon Moon, Sopel (ex Willie), ChatSharp, Communi, girc, irc-framework, Kitteh IRC Client Library, Rust irc, Warren, BitlBee, Matrix2051