c+CalcLantern

UTC-offset time conversion

Convert a date and time between two known UTC offsets.

How this works

Destination local time = source local time − source UTC offset + destination UTC offset.

Example

Using the example inputs, destination time is 06:00.

Source date
2026-10-22
Source time
14:00
Source UTC offset
-7 hours
Destination UTC offset
9 hours
Destination time
06:00

Enter the correct offset for the date, including any daylight-saving change.

Scope and assumptions

Fixed offsets only, not automatic city time zones or daylight-saving rules.

NIST daylight saving time

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