World Clock

2026-01-15T12:00:00.000Z renders in 4 timezone(s).

How it works

• Used the supplied instant as the reference.
• For each zone, resolved the wall clock, calendar date, weekday, UTC offset, abbreviation and daylight-saving state from the runtime IANA database.
• Returned the zones in the order requested.

• Results depend on the reference instant; supplying one makes the output reproducible.

Methodology

1. Take the reference instant from the supplied value, or from the device clock when none is supplied.
2. For each named zone, resolve the wall clock and date through the runtime IANA time-zone database.
3. Report the UTC offset, abbreviation and daylight-saving state that the IANA data gives for that instant.

Time model

• Time source: UTC.
• Timezone: Each zone's wall clock is rendered from the reference instant using the named IANA zone rules.
• Locale: Weekday and abbreviation names are fixed English labels from the runtime's en-US locale; no user locale is applied.
• Daylight saving: Daylight-saving state is derived from the zone's own January/July offsets for the reference year.
• Reference date: An optional instant. When omitted, the current instant is read from the visitor's environment at runtime; a supplied instant fixes the result. Examples always supply one.

Usage

1. Leave the instant blank to use the current time, or enter an instant to reproduce a moment.
2. List one IANA timezone per line, up to the documented maximum.
3. Read each zone's wall clock, date, offset and daylight-saving state.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

A fixed instant across four zones

{
  "instant": "2026-01-15T12:00:00Z",
  "zones": [
    "UTC",
    "America/New_York",
    "Asia/Kathmandu",
    "Australia/Lord_Howe"
  ]
}

Southern-hemisphere summer

{
  "instant": "2026-01-15T00:00:00Z",
  "zones": [
    "Australia/Sydney",
    "Pacific/Auckland",
    "Europe/London"
  ]
}

Limitations

Why an explicit reference matters

A clock that always shows 'now' is not reproducible. This tool accepts an explicit instant so the same reference can be rendered anywhere, while the default stays live for everyday use.