CRN0

SGT to AST cron converter

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

UTC+8
UTC-4
0 21 * * *

At 21:00 every day in Halifax.

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

SingaporeHalifax

Examples

SGTAST
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 SGT to AST?

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

What is the time difference between SGT and AST?

Singapore Time is UTC+8 and Atlantic Time is UTC-4 / UTC-3. Right now aST is currently 12 hours behind SGT.

Does daylight saving time affect SGT to AST cron conversion?

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

What is midnight SGT in AST cron?

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

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