TIME-ZONE ABBREVIATION CONVERTER
Convert GMT, UTC, KST
and other time zones.
Type a familiar abbreviation such as UTC, KST, JST, EST, EDT, PST, or PDT and choose from matching fixed offsets.
GMT / UTC → KST
same day
—Choose a date and time.
—→—
Calculated with the fixed UTC offsets of the selected abbreviations.
QUICK REFERENCE
Common GMT
to KST times
How are abbreviations handled?
GMT and UTC are both UTC+00:00 here.
KST is UTC+09:00.
EST and EDT are separate choices with different offsets.
Before you convert
This tool uses abbreviations with fixed UTC offsets, not city-based time-zone rules.
Daylight saving is not automatic
Choose PST or PDT, and EST or EDT, explicitly. The date does not automatically switch an abbreviation for daylight saving time.
The calendar date may change
15:00 GMT is 00:00 KST on the next day. Check both the converted date and the day-shift label.
GMT and UTC share an offset
Both are treated as UTC+00:00. KST is UTC+09:00, so the difference is always nine hours in this calculator.
Where fixed-offset conversion helps
Use explicit abbreviations when the source already states the intended offset.
Cross-region meetings
Convert a stated UTC, GMT, EST, EDT, PST, or PDT time and confirm whether the calendar day changes.
Maintenance windows
Translate a fixed-offset cloud or network maintenance notice into the team's local reference.
Half-hour and quarter-hour offsets
Use listed abbreviations such as IST or NPT when a whole-hour shortcut would be wrong.
Date-aware examples
Each check includes the target date as well as the time.
GMT to KST
2026-07-20 15:00 GMT becomes 2026-07-21 00:00 KST.
NPT to KST
09:00 NPT becomes 12:15 KST, preserving the 45-minute offset.
PST and PDT
08:00 PST and 08:00 PDT differ by one hour; select the abbreviation stated by the source.
Time converter FAQ
Does the date switch PST to PDT automatically?
No. Choose the abbreviation that matches the source schedule.
Why did the target date change?
Adding or subtracting the offset crossed midnight. Check the displayed day-shift label.
Can I enter an IANA city zone?
No. This tool accepts the fixed abbreviations in its local list rather than city-based rules.
Conversion review
Last reviewed · Logic version 20260724-1 · Vectors: GMT/KST, NPT, PST/PDT
Time-zone abbreviation and DST guide · Report a time conversion issue