CRN0

JST to AST cron converter

AST is currently 13 hours behind JST. Convert AST to JST

UTC+9
UTC-4
0 20 * * *

At 20:00 every day in Halifax.

Show timeline and next runs
Tokyo
00061218
00061218
Halifax
Each amber mark is a run time. The top strip shows Tokyo local time and the bottom strip shows Halifax local time, lined up so the same moment sits on the same vertical line. Shaded areas are night hours.

Same moment as “at 09:00 every day” in Tokyo.

TokyoHalifax

Examples

JSTAST
0 9 * * *
0 20 * * *
0 9 * * 1-5
0 20 * * 0-4
*/15 * * * *
*/15 * * * *
0 0 * * *
0 11 * * *
30 2 * * 0
30 13 * * 6
0 0 1 * *
0 11 31 * *
0 */6 * * *
0 5-23/6 * * *
0 17 * * 5
0 4 * * 5
Every hour of the day
0 0 * * *0 11 * * *day before
0 1 * * *0 12 * * *day before
0 2 * * *0 13 * * *day before
0 3 * * *0 14 * * *day before
0 4 * * *0 15 * * *day before
0 5 * * *0 16 * * *day before
0 6 * * *0 17 * * *day before
0 7 * * *0 18 * * *day before
0 8 * * *0 19 * * *day before
0 9 * * *0 20 * * *day before
0 10 * * *0 21 * * *day before
0 11 * * *0 22 * * *day before
0 12 * * *0 23 * * *day before
0 13 * * *0 0 * * *
0 14 * * *0 1 * * *
0 15 * * *0 2 * * *
0 16 * * *0 3 * * *
0 17 * * *0 4 * * *
0 18 * * *0 5 * * *
0 19 * * *0 6 * * *
0 20 * * *0 7 * * *
0 21 * * *0 8 * * *
0 22 * * *0 9 * * *
0 23 * * *0 10 * * *

Questions

How do I convert a cron expression from JST to AST?

AST is currently 13 hours behind JST. Subtract 13 hours to the hour field, and shift the day-of-week if the time crosses midnight. For example, 0 9 * * 1-5 (weekdays at 09:00 JST) becomes 0 20 * * 0-4 in AST.

What is the time difference between JST and AST?

Japan Standard Time is UTC+9 and Atlantic Time is UTC-4 / UTC-3. Right now aST is currently 13 hours behind JST.

Does daylight saving time affect JST to AST cron conversion?

AST observes daylight saving time, so the difference between JST (UTC+9) and AST (UTC-4 / UTC-3) changes during the year. Re-check your converted cron after each DST change.

What is midnight JST in AST cron?

Midnight in JST (0 0 * * *) is 0 11 * * * in AST, on the previous day.

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