Cron Expression for Every 12 Hours
0 */12 * * *→Runs twice a day: midnight and noon0
Minute
0–59
*/12
Hour
0–23
*
Day
1–31
*
Month
1–12
*
Weekday
0–7
Quick Examples
How It Works
Using
0 */12 * * *, the task executes at 00:00 and 12:00 every day — exactly twice a day. This is ideal for tasks that should run 'morning and evening' or that split a daily workload in half.Common Use Cases
- 1Sending morning and evening digest emails
- 2Twice-daily security scan
- 3Syncing a large dataset in two batches
Linux Crontab Example
0 */12 * * * /app/send-digest.shAdd this line to your crontab with crontab -e
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More Every X Hours
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0 * * * *
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0 */6 * * *
Runs every 4 hours at minute 0
0 */4 * * *
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15 * * * *
Runs at 30 minutes past every hour
30 * * * *
Runs at 45 minutes past every hour
45 * * * *
Runs every 5 hours at minute 0
0 */5 * * *
Runs every 7 hours at minute 0
0 */7 * * *