Input

Inputs include the reference timezone, reference time, search keyword, view mode, and 12/24-hour preference. The reference timezone is selected from a fixed offset table rather than an IANA political timezone. The reference time uses a 0-1439 minute slider with a 15-minute step. Search matches region names, offset labels, and offset fragments such as Tokyo, Berlin, +09:00, or -03:30.

Output

Outputs include each offset’s local time, UTC label, difference from the reference offset, date-change label, and example regions. The card view is best for scanning all zones quickly. The timeline view lays out the 24-hour day horizontally, which is better for checking overlap across working hours. If the target local time lands before or after the reference date, the page marks previous day, next day, or a multi-day difference.

How it works

The calculation runs synchronously in the browser. The tool subtracts the reference UTC offset from the reference local minutes to get the same moment in UTC minutes, then adds every target offset and normalizes the result into the 0-1439 minute display range. The date delta is derived from the non-normalized minute value divided by 1440 and floored. Because this is a fixed UTC offset table, it does not query daylight saving time or local legal timezone rules; during US daylight saving time, for example, New York should usually be checked as UTC-04:00 rather than the fixed UTC-05:00 row.

Supported modes

• 38 fixed UTC offsets
• Reference timezone selector
• Draggable timeline
• Region and offset search
• Overview cards
• Timeline view
• Date-change labels
• 12/24-hour toggle

Cross-timezone conversion example

Reference timezone: Beijing, Singapore, Manila (UTC+08:00)
Reference time: 15:30
Target timezone: Eastern Time - New York, Toronto (UTC-05:00)

New York fixed-offset time: 02:30
Difference: 13h behind
Date label: same day, unless the reference time is early enough to cross into the previous day