Zone & HourJST to UTC Time Converter
UTC is 9 hours behind of JST.
JST: Japan Standard Time, UTC+09:00.
UTC: Coordinated Universal Time, UTC+00:00.
For a city that changes clocks, use the date-aware city converter.
Convert a time
9:00 AM JST = 12:00 AM UTC (same day)
24-hour JST to UTC conversion table
These are fixed-offset examples. They apply whenever the two abbreviations have the exact meanings stated above.
| JST · UTC+09:00 | UTC · UTC+00:00 | Day |
|---|---|---|
| 12:00 AM | 3:00 PM | Previous day |
| 1:00 AM | 4:00 PM | Previous day |
| 2:00 AM | 5:00 PM | Previous day |
| 3:00 AM | 6:00 PM | Previous day |
| 4:00 AM | 7:00 PM | Previous day |
| 5:00 AM | 8:00 PM | Previous day |
| 6:00 AM | 9:00 PM | Previous day |
| 7:00 AM | 10:00 PM | Previous day |
| 8:00 AM | 11:00 PM | Previous day |
| 9:00 AM | 12:00 AM | Same day |
| 10:00 AM | 1:00 AM | Same day |
| 11:00 AM | 2:00 AM | Same day |
| 12:00 PM | 3:00 AM | Same day |
| 1:00 PM | 4:00 AM | Same day |
| 2:00 PM | 5:00 AM | Same day |
| 3:00 PM | 6:00 AM | Same day |
| 4:00 PM | 7:00 AM | Same day |
| 5:00 PM | 8:00 AM | Same day |
| 6:00 PM | 9:00 AM | Same day |
| 7:00 PM | 10:00 AM | Same day |
| 8:00 PM | 11:00 AM | Same day |
| 9:00 PM | 12:00 PM | Same day |
| 10:00 PM | 1:00 PM | Same day |
| 11:00 PM | 2:00 PM | Same day |
What JST and UTC mean
JST: Japan Standard Time
JST is UTC+09:00. Tokyo currently keeps this offset throughout the year. A representative location is Tokyo, whose IANA identifier is Asia/Tokyo.
UTC: Coordinated Universal Time
UTC is a time standard and never shifts for daylight saving. A representative location is UTC reference, whose IANA identifier is Etc/UTC.
Common conversion examples
- 6:00 AM JST becomes 9:00 PM UTC on the previous day.
- 9:00 AM JST becomes 12:00 AM UTC.
- 12:00 PM JST becomes 3:00 AM UTC.
- 6:00 PM JST becomes 9:00 AM UTC.
- 9:00 PM JST becomes 12:00 PM UTC.
Frequently asked questions
Does this table change for daylight saving?
No. The offsets attached to these abbreviations stay fixed. A city may switch to a differently named abbreviation. JST is not a daylight-saving designation in the interpretation used here.
Should I put an abbreviation in a meeting invitation?
Use an IANA city time zone and a full date. Abbreviations are useful shorthand when everyone agrees on the meaning, but they do not carry the complete rules that a calendar needs for recurring events.
Why can the day change?
The difference is 540 minutes. Adding or subtracting that amount can move the destination time before midnight or beyond the end of the source day. The last column makes that change explicit.