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Time Zone Converter

Convert a date and time between world time zones, DST aware.

By CalcHub Editorial · Last reviewed

Quick answer

  • Formula: UTC instant = wall time in source zone (offset resolved iteratively for DST); result = that instant rendered in the target zone
  • Worked example — Converted date & time: January 15, 2026, 5:00 PM GMT (full example below).

Time Zone Converter

Worked example result
Converted date & timeJanuary 15, 2026, 5:00 PM GMT
Offset difference (to − from)+5 hours

Noon in New York on January 15, 2026 is 5:00 PM in London the same day — London is 5 hours ahead in winter.

Diagram: how the Time Zone Converter works — you enter Year, Month (1–12), Day, Hour (0–23), Minute, From time zone, To time zone; it applies the formula UTC instant = wall time in source zone (offset resolved iteratively…; and the worked example gives Converted date & time: January 15, 2026, 5:00 PM GMT.
How the Time Zone Converter works — the inputs, the formula, and a worked example (Converted date & time: January 15, 2026, 5:00 PM GMT).

Pick a date and time in one time zone and see the same moment in another zone, together with the offset difference between the two zones on that date.

The conversion uses the IANA time zone database, so daylight saving time is applied correctly for the date you choose — January dates use standard time in the northern hemisphere, for example.

The formula

UTC instant = wall time in source zone (offset resolved iteratively for DST); result = that instant rendered in the target zone

Worked example

Noon in New York on January 15, 2026 is 5:00 PM in London the same day — London is 5 hours ahead in winter.

Worked example for the Time Zone Converter: with Year 2026, Month (1–12) 1, Day 15, the result is Converted date & time: January 15, 2026, 5:00 PM GMT; Offset difference (to − from): +5 hours.
The worked example, with the example values entered and the results they give.

The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.

Frequently asked questions

Why does the offset change with the date?

Many zones move their clocks forward in summer (daylight saving time) on different dates, so the difference between two zones is not constant through the year. Always convert using the actual date of the event.

What does the offset difference mean?

It is the target zone's UTC offset minus the source zone's offset at that moment. A positive value means clocks in the target zone read later than in the source zone.

Category: Date & Time calculators

Sources & methodology

This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.

Content last reviewed by CalcHub Editorial.

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