CRN0

AST to CST cron converter

CST is currently 12 hours ahead of AST. Convert CST to AST

UTC-4
UTC+8
0 21 * * *

At 21:00 every day in Beijing.

Show timeline and next runs
Halifax
00061218
00061218
Beijing
Each amber mark is a run time. The top strip shows Halifax local time and the bottom strip shows Beijing 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 Halifax.

HalifaxBeijing

Examples

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

Questions

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

CST is currently 12 hours ahead of AST. Add 12 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 AST) becomes 0 21 * * 1-5 in CST.

What is the time difference between AST and CST?

Atlantic Time is UTC-4 / UTC-3 and China Standard Time is UTC+8. Right now cST is currently 12 hours ahead of AST.

Does daylight saving time affect AST to CST cron conversion?

AST observes daylight saving time, so the difference between AST (UTC-4 / UTC-3) and CST (UTC+8) changes during the year. Re-check your converted cron after each DST change.

What is midnight AST in CST cron?

Midnight in AST (0 0 * * *) is 0 12 * * * in CST.

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