CRN0

CST to AST cron converter

AST is currently 12 hours behind CST. Convert AST to CST

UTC+8
UTC-4
0 21 * * *

At 21:00 every day in Halifax.

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

BeijingHalifax

Examples

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

Questions

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

AST is currently 12 hours behind CST. Subtract 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 CST) becomes 0 21 * * 0-4 in AST.

What is the time difference between CST and AST?

China Standard Time is UTC+8 and Atlantic Time is UTC-4 / UTC-3. Right now aST is currently 12 hours behind CST.

Does daylight saving time affect CST to AST cron conversion?

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

What is midnight CST in AST cron?

Midnight in CST (0 0 * * *) is 0 12 * * * in AST, on the previous day.

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