Timezone converter bot for Telegram

Time-zone converter for Telegram groups and inline use, DST-correct.

WhenIsItBot converts a time across every timezone represented in a Telegram group. Each member sets their zone once with /tz, and /when <time> in that group replies with a card showing that time converted for everyone who's set one, plus UTC. Run the same command in a DM with the bot and it shows just your own zone.

It also works inline — type the bot's username followed by a time (e.g. "3pm tomorrow") in any chat to get a one-off conversion without adding the bot to that chat, and daylight saving is always resolved live rather than hardcoded.

Commands

Command	Example	Does
/tz	/tz Europe/Warsaw	Save your zone: IANA name, common abbreviation (CET, PST…), or an offset like +2 or -5:30.
/when	/when 3pm tomorrow	In a group: convert a time (in your zone) to every distinct zone set by members of the chat, plus UTC — up to 12 zones. In a DM with the bot: shows just your own zone.
/now	/now	Current time — every member zone plus UTC in a group, or just your own zone in a DM with the bot.
/preset	/preset add Asia/Tokyo	Save zones under your account; add/remove/list. Free: 3 presets. Presets are only used by inline mode on Pro — free presets are saved but not pulled into inline results.
/team	/team add core Europe/Warsaw America/New_York	Pro: save a named, shareable set of zones for the whole group.
/pro	/pro	Unlock unlimited presets and /team for a one-time 150 Stars payment.

Free vs Pro

Privacy

• Each member's saved timezone and preset zones are stored under their user id; named /team sets are stored per group for Pro.
• No message content is stored — only zone names/offsets you explicitly save with /tz, /preset, or /team.
• Daylight saving offsets are computed live via the JavaScript Intl API rather than stored, so they're never stale.

See the full privacy page for what every bot in Tiny Telegram Tools stores.

FAQ

What timezone formats can I use with /tz?

IANA names (Europe/Warsaw, America/New_York), common abbreviations (UTC, GMT, CET, CEST, EST, EDT, PST, PDT, IST, JST, AEST), or an offset like +2 or -5:30.

How many zones does /when show?

In a group, every distinct zone set by members who've run /tz, plus UTC, deduped, capped at 12 zones. In a DM with the bot, it shows only your own zone.

Can I use it without adding the bot to a group?

Yes — inline mode (type the bot's username followed by a time, e.g. "3pm tomorrow", in any chat) gives you a one-off conversion showing your own zone, UTC, and a small default set of zones (New York, London, Tokyo). Pro users get their own saved presets in that inline result instead of the defaults.

What does Pro add?

Unlimited saved preset zones (free caps at 3), inline results built from your own presets instead of the default zone set, and /team, a named zone set the whole group can reuse, for a one-time 150 Stars payment.

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