Is the input time in the From timezone?
Yes. The clock time you enter is treated as local time in the From zone.
Timezone Converter
Convert a local date-time from one major timezone to another—useful for calls, flights, and global teams.
Convert between timezones
Enter a date-time, choose the source zone, then pick the destination zone.
About this calculator
How to use Timezone Converter, plus the formulas and logic behind the results.
Tool description
The Timezone Converter translates a wall-clock time from one IANA timezone to another. It helps schedule meetings and travel across regions with different offsets and daylight-saving rules.
How to use
- Enter the local date and time you know.
- Select the timezone that time belongs to (From).
- Select the timezone you want (To).
- Select Convert to view the equivalent local time.
Formulas & reference
instant = parse(datetime in from_tz)result = instant projected into to_tzoffset shown as ±HH:MM for each zone at that instant
Conversion tips
- Input time is interpreted in the “From” zone
- Offsets include DST when the zone observes it
- UTC is available as a neutral reference
Calculation logic
The input is parsed with the source DateTimeZone, producing an absolute instant. setTimezone() then formats that instant in the destination zone, including the correct offset for that date (DST-aware).
The list focuses on commonly used zones. DST transitions follow IANA timezone data available to PHP on this server.
Timezone Converter FAQ
Common questions about this calculator and how to use the results.
Does daylight saving time apply?
Yes, when the selected IANA zone observes DST on that date.
Why isn’t my city listed?
The converter includes widely used zones. Pick the zone that matches your region’s offset rules.
What is UTC?
Coordinated Universal Time—the baseline reference without DST.
Can I convert to the same zone?
Yes. The result will match the input local time with that zone’s offset.
Are historical offsets accurate?
Accuracy depends on the server’s timezone database for past DST rule changes.
Do I need to enter seconds?
Minutes are enough; seconds default to zero.
How do I plan a meeting for three cities?
Convert from one city to each of the others using the same source time.