CRN0

AST to HST cron converter

HST is currently 6 hours behind AST. Convert HST to AST

UTC-4
UTC-10
0 3 * * *

At 03:00 every day in Honolulu.

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

HalifaxHonolulu

Examples

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

Questions

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

HST is currently 6 hours behind AST. Subtract 6 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 3 * * 1-5 in HST.

What is the time difference between AST and HST?

Atlantic Time is UTC-4 / UTC-3 and Hawaii Time is UTC-10. Right now hST is currently 6 hours behind AST.

Does daylight saving time affect AST to HST cron conversion?

AST observes daylight saving time, so the difference between AST (UTC-4 / UTC-3) and HST (UTC-10) changes during the year. Re-check your converted cron after each DST change.

What is midnight AST in HST cron?

Midnight in AST (0 0 * * *) is 0 18 * * * in HST, on the previous day.

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