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Zone to zone

CST to JST — Japan Standard Time is 15 hours ahead

Japan Standard Time (JST) is 15 hours ahead of Central Time (CST) while both are on standard time. Once daylight saving starts the gap becomes 14 hours ahead, so any recurring meeting between these two regions moves by an hour twice a year.

Standard time

15 hours ahead

Applies while neither zone is on daylight saving — broadly November to March in the northern hemisphere.

Daylight saving

14 hours ahead

Applies while the clocks are forward. This pair does not keep a constant gap, so check the date.

Full-day table Questions

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How the two zones line up

Central Time sits at UTC−6 in winter and UTC−5 in summer. Japan Standard Time sits at UTC+9 all year. The difference between those two offsets is the number you add or subtract.

Daylight saving

Standard working days do not overlap at all. One side will need to take the call early or late, so alternate who makes the sacrifice.

Where this conversion gets used

  • Offshore development stand-ups
  • overnight support handovers
  • outsourced finance teams
  • supplier calls

CST to JST — every hour

Both columns are computed from the IANA database, so they follow the real transition dates.

CST JST — standard JST — daylight saving
12:00 am 3:00 pm 2:00 pm
1:00 am 4:00 pm 3:00 pm
2:00 am 5:00 pm 4:00 pm
3:00 am 6:00 pm 5:00 pm
4:00 am 7:00 pm 6:00 pm
5:00 am 8:00 pm 7:00 pm
6:00 am 9:00 pm 8:00 pm
7:00 am 10:00 pm 9:00 pm
8:00 am 11:00 pm 10:00 pm
9:00 am 12:00 am (next day) 11:00 pm
10:00 am 1:00 am (next day) 12:00 am (next day)
11:00 am 2:00 am (next day) 1:00 am (next day)
12:00 pm 3:00 am (next day) 2:00 am (next day)
1:00 pm 4:00 am (next day) 3:00 am (next day)
2:00 pm 5:00 am (next day) 4:00 am (next day)
3:00 pm 6:00 am (next day) 5:00 am (next day)
4:00 pm 7:00 am (next day) 6:00 am (next day)
5:00 pm 8:00 am (next day) 7:00 am (next day)
6:00 pm 9:00 am (next day) 8:00 am (next day)
7:00 pm 10:00 am (next day) 9:00 am (next day)
8:00 pm 11:00 am (next day) 10:00 am (next day)
9:00 pm 12:00 pm (next day) 11:00 am (next day)
10:00 pm 1:00 pm (next day) 12:00 pm (next day)
11:00 pm 2:00 pm (next day) 1:00 pm (next day)

Questions people ask

15 hours ahead during standard time, and 14 hours ahead while daylight saving is running.

Related conversions

CST to IST MST to IST PST to AEST CET to JST

All conversions →

Booking something recurring?

A fixed clock time drifts when either side changes its clocks. Our guides explain how to stop that happening.

Read the DST guide Plan a meeting