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yutils
Example

Input

2026-05-13 14:00 (Asia/Seoul)
Targets: America/New_York, Europe/London, UTC

Output

Asia/Seoul:        2026-05-13 14:00 KST
UTC:               2026-05-13 05:00 UTC
Europe/London:     2026-05-13 06:00 BST
America/New_York:  2026-05-13 01:00 EDT

Note

Backed by the IANA timezone database — 400+ regions. DST transitions and historical timezone changes are honored exactly.

Usage / FAQ

When to use

  • Coordinate meetings across Korea, US, and Europe
  • Convert UTC log timestamps into your local zone
  • Plan global deployments — which user zones are affected when
  • Spot DST transitions (especially for US / EU meetings)
  • Learn what timezone abbreviations (KST, EDT, BST) actually mean

FAQ

Q.EST vs EDT?
A.EST = Eastern Standard Time (winter, UTC-5). EDT = Eastern Daylight Time (summer, UTC-4). Zones with DST switch twice per year. Use `America/New_York` to handle it automatically.
Q.Asia/Seoul vs KST?
A.KST is an abbreviation; Asia/Seoul is an IANA identifier. KST is ambiguous — used by both Korea and Kazakhstan. Always use IANA identifiers in code.
Q.Is this useful in Korea where there's no DST?
A.Yes — essential for cross-border collaboration. Korea hasn't observed DST since the 1988 Seoul Olympics, so Korean time is simply UTC+9 year-round.
Fun facts

  • The IANA Time Zone Database (tz database / Olson DB) was started by Arthur David Olson at Bell Labs in 1986. It tracks every historical change for every time zone in the world (DST introduced or repealed, offset shifts) — and `America/New_York` style 'Continent/City' identifiers are his convention.

    IANA — Time Zones

  • In 2011, Samoa skipped a day across the international date line — Thursday, December 29, was followed by Saturday, December 31. Friday, December 30, simply didn't exist. The change moved Samoa into the same time zone as Australia and New Zealand, and the tz db's `Pacific/Apia` records the jump precisely.

    Wikipedia — Time in Samoa

  • Nepal Standard Time is UTC+5:45 — an unusual 45-minute offset. The popular explanation is a political choice to be exactly one hour ahead of India's +5:30. The tz db records it as `Asia/Kathmandu`, preserving the historic context of every 30- and 45-minute offset.

    Wikipedia — Nepal Standard Time

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