ZoneSync

Time Zone Converter

Pick two time zones — see the local time in each side-by-side, with daylight saving handled.

From

UTC−04:00

Tue, Sep 8

UTC+09:00

10:00 PM

Tue, Sep 8

Asia/Tokyo is 13 hours ahead of America/New York.

What you entered

Time: 09:00From: America/New YorkTo: Asia/Tokyo

1
America/New York offset from UTC
IANA time zone database lookup= UTC−04:00
2
Asia/Tokyo offset from UTC
IANA time zone database lookup= UTC+09:00
3
Difference between the two zones
(UTC+09:00) − (UTC−04:00)= +13h
4
Apply the difference to the source time
09:00 + 13 hours= 10:00 PM

Result

Time in Asia/Tokyo: 10:00 PM

09:00 in America/New York is 10:00 PM in Asia/Tokyo — a difference of 13 hours ahead.

UTC offsets for major time zones in January

Offset from UTC in hours during January, when the northern hemisphere is on standard time and the southern is on daylight saving.

Zone	City	Offset in January
America/Los_Angeles	Los Angeles	UTC-8
America/New_York	New York	UTC-5
UTC	Coordinated Universal Time	UTC+0
Europe/London	London	UTC+0
Europe/Paris	Paris	UTC+1
Asia/Kolkata	India	UTC+5:30
Asia/Tokyo	Tokyo	UTC+9
Australia/Sydney	Sydney	UTC+11

These are January offsets and several change with daylight saving: London moves to UTC+1 and New York to UTC-4 in their summer, while Sydney drops to UTC+10 in the southern winter. Because the hemispheres shift at different times, the gap between London and Sydney varies between 9 and 11 hours through the year rather than staying fixed - which is why scheduling recurring meetings across hemispheres breaks twice a year. India at UTC+5:30 is one of several zones on a half-hour offset, and Nepal uses UTC+5:45. Tokyo and India observe no daylight saving at all.

Tips for global meetings

Aim for an overlap window where both sides are in their standard work hours. The closer your zones are, the easier — but for far-apart pairs (e.g., US ↔ Asia), rotate who takes the awkward time.

Frequently asked questions

It's 3 PM in New York — what time is it in Tokyo?

Tokyo is UTC+9 and New York is UTC-5 (or UTC-4 during daylight saving). The difference is 13-14 hours ahead. At 3 PM EST (winter), it's 5 AM the next day in Tokyo. At 3 PM EDT (summer), it's 4 AM the next day.

What's the best time to schedule a call between London and San Francisco?

London is 8 hours ahead of San Francisco (GMT vs PST). An overlap of reasonable work hours: 9 AM SF = 5 PM London, or 8 AM SF = 4 PM London. Morning calls for SF, end-of-day for London works best.

Does this handle daylight saving time changes?

Yes — the converter accounts for each zone's DST rules automatically. Watch out for the weeks when one country has changed clocks but the other hasn't yet (e.g., the US and Europe switch on different dates in spring and fall, causing the offset to shift temporarily).

How is this different from the date difference calculator?

This tool converts the same moment in time between two time zones ('it's 2 PM here, what time is it there?'). The date difference calculator counts elapsed time between two dates. Use this for scheduling, that one for deadlines and countdowns.