All IANA timezones (~600). Major cities are indexed by common name (New York, London, Tokyo) and by UTC offset (UTC+5, UTC-7).

Yes — the tool uses zone rules, not fixed offsets. London is UTC+0 in winter, UTC+1 in summer; the tool applies the right offset per date.

Multi-zone comparison?

Yes — convert one time to many zones simultaneously. Useful for scheduling across distributed teams.

Why am I one hour off?

Almost always DST. Both source and destination can have DST at different start/end dates. The tool's output is authoritative — your system time might be wrong.

Timezone Converter | DevTools Surf

DevTools Surf

Example: Timezone Converter

A worked example, rendered from real sample data. Sign in to run the tool on your own input.

Input

now

Output

═ Source
Input:    now
Read as:  the current instant
UTC:      2026-09-20T12:07:33.079Z
Unix:     1789906053
Relative: now

═ Zones (24-hour clock)
UTC                  Sun 20 Sep 2026  12:07  UTC+00:00  UTC      weekend
America/New_York     Sun 20 Sep 2026  08:07  UTC-04:00  EDT      weekend
America/Chicago      Sun 20 Sep 2026  07:07  UTC-05:00  CDT      weekend
America/Denver       Sun 20 Sep 2026  06:07  UTC-06:00  MDT      weekend
America/Los_Angeles  Sun 20 Sep 2026  05:07  UTC-07:00  PDT      weekend
Europe/London        Sun 20 Sep 2026  13:07  UTC+01:00  GMT+1    weekend
Europe/Paris         Sun 20 Sep 2026  14:07  UTC+02:00  GMT+2    weekend
Europe/Berlin        Sun 20 Sep 2026  14:07  UTC+02:00  GMT+2    weekend
Asia/Tokyo           Sun 20 Sep 2026  21:07  UTC+09:00  GMT+9    weekend
Asia/Shanghai        Sun 20 Sep 2026  20:07  UTC+08:00  GMT+8    weekend
Asia/Kolkata         Sun 20 Sep 2026  17:37  UTC+05:30  GMT+5:30 weekend
Asia/Dubai           Sun 20 Sep 2026  16:07  UTC+04:00  GMT+4    weekend
Australia/Sydney     Sun 20 Sep 2026  22:07  UTC+10:00  GMT+10   weekend
Pacific/Auckland     Mon 21 Sep 2026  00:07  UTC+12:00  GMT+12   asleep

═ Meeting overlap (09:00–17:00 local, weekdays)
0 of 14 zones inside working hours.
Outside: UTC (12:07), America/New_York (08:07), America/Chicago (07:07), America/Denver (06:07), America/Los_Angeles (05:07), Europe/London (13:07), Europe/Paris (14:07), Europe/Berlin (14:07), Asia/Tokyo (21:07), Asia/Shanghai (20:07), Asia/Kolkata (17:37), Asia/Dubai (16:07), Australia/Sydney (22:07), Pacific/Auckland (00:07)

═ Daylight savi
…

About Timezone Converter

Timezone Converter preview - Date / Time tool

Convert a date-time between multiple timezones. Part of the DevTools Surf developer suite. Browse more tools in the Date / Time collection.

Use Cases

Scheduling meetings across distributed international teams
Converting server UTC timestamps to local time for debugging
Planning deployment windows across multiple geographic regions
Calculating deadline times for global content publication

Tips

Convert meeting times across multiple timezones at once
Use UTC as the reference point for server-side timestamps
Account for daylight saving time shifts in your conversions

Fun Facts

Time zones were first proposed by Sir Sandford Fleming in 1879 after missing a train in Ireland due to a printed schedule error.
There are currently 38 distinct UTC offsets in use worldwide, including unusual ones like UTC+5:45 (Nepal) and UTC+8:45 (Eucla, Australia).
China spans five geographical time zones but uses a single official time (UTC+8), meaning sunrise in western China can occur as late as 10 AM.

FAQ

How many zones?: All IANA timezones (~600). Major cities are indexed by common name (New York, London, Tokyo) and by UTC offset (UTC+5, UTC-7).
DST handled?: Yes — the tool uses zone rules, not fixed offsets. London is UTC+0 in winter, UTC+1 in summer; the tool applies the right offset per date.
Multi-zone comparison?: Yes — convert one time to many zones simultaneously. Useful for scheduling across distributed teams.
Why am I one hour off?: Almost always DST. Both source and destination can have DST at different start/end dates. The tool's output is authoritative — your system time might be wrong.

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