Time Zone Calculator
Convert a date and time between common UTC offsets.
Convert a specific date and time from one UTC offset to another — useful for scheduling calls, meetings, or events across regions.
How Time Zone Calculator Works
The calculator treats the date and time you enter as local time in your selected "from" UTC offset. It first converts that to Coordinated Universal Time (UTC) by removing the offset, then applies the "to" offset to calculate the equivalent local time in the target zone.
Because offsets can push a time across midnight, the result also reports how many calendar days shifted between the source and target times — a common source of scheduling confusion when converting between zones far apart.
See It In Action
Who Uses Time Zone Calculator and Why
- Scheduling a call or meeting with someone in a different time zone by converting a proposed time to their local offset.
- Working out what time a flight lands locally when departure time is given in a different zone.
- Converting an event time listed in UTC into your own zone's offset before adding it to a calendar.
- Checking whether a time conversion pushes the event into the previous or next calendar day.
Mistakes to Avoid
- Not adjusting for daylight saving time — the calculator works from fixed UTC offsets, so during DST periods you need to select the offset your zone is actually observing, not its standard-time offset.
- Overlooking that a large offset difference can shift the date, not just the time — a conversion late at night in one zone can land on the next calendar day in another.
- Selecting the wrong "from" or "to" offset by mixing up which zone the source time is actually in.
Tips for Best Results
- Double-check whether your zone is currently observing daylight saving time before picking an offset, since this tool doesn't apply DST automatically.
- If scheduling across several time zones, convert to UTC first as a common reference point, then convert from UTC to each participant's zone.
Fixing Common Problems
The converted time is off by exactly one hour from what I expected. — This is almost always a daylight saving time mismatch — select the offset that reflects what your zone is actually observing right now, not its year-round standard offset.
The converted date is different from the original date. — This is expected when the offset difference is large enough to cross midnight — the time itself converted correctly, it just landed on an adjacent calendar day.
Terms Explained
UTC offset: The fixed number of hours a time zone differs from Coordinated Universal Time, before any daylight saving adjustment.
Daylight saving time (DST): A seasonal one-hour shift observed in many regions, which changes a zone's effective UTC offset for part of the year.