Cron Expression: Every 30 Minutes
The expression is */30 * * * *. Paste it above to read it in English and preview the next local run times.
The expression
*/30 * * * * runs a job every 30 minutes: at :00 and :30 past every hour.
Field by field
*/30 is a step in the minute field. Because the range is 0–59, it lands only on 0 and 30 — twice an hour.
Equivalent form
0,30 * * * * does exactly the same thing and some people find it clearer.
Common variations
Every 30 minutes during business hours: 0,30 9-17 * * 1-5.
FAQ
How many times a day does */30 * * * * run?
48 times — twice per hour.
Is */30 the same as 0,30?
Yes, in the minute field they are identical.
How do I run every 30 minutes only during the day?
Restrict the hour field, e.g. 0,30 8-20 * * *.