How to set a timed trigger rule?

Timed trigger rules support inputting Crontab expressions.

Caution: As Kubernetes uses UTC (Coordinated Universal Time), when setting the timed trigger rule for a scheduled task, if you need to set it to local time (such as Beijing time), you need to first convert the local time (GMT+8) to UTC time, and then convert the UTC time to a Crontab expression.

Conversion to UTC time

Time conversion rules: Local time - Time difference = UTC

Take BST to UTC time as an example:

Beijing is located in GMT+8, and the time difference between Beijing time and UTC time is 8 hours. The time conversion rule is:

Beijing time - 8 = UTC

Example 1: Convert Beijing time 9:42 to UTC time: 42 09 - 00 08 = 42 01, which means the UTC time is 1:42 AM.

Example 2: Convert Beijing time 4:32 AM to UTC time: 32 04 - 00 08 = -68 03. If it is a negative number, it means the previous day, and another conversion is needed: -68 03 + 00 24 = 32 20, which means the UTC time is 8:32 PM the previous day.

Write Crontab expressions

Basic Formats: minute hour day month week

Value range

The following special characters are allowed in the minute, hour, day, month, and weekday fields:

• ,: Value list separator, used to specify multiple values. For example: 1,2,5,7,8,9.
• -: Range of values specified by the user. For example: 2-4, which means 2, 3, 4.
• *: Represents the entire time period. For example, when used in the minute field, it means every minute.
• /: Used to specify the increment of values. For example: n/m means starting from n, increment by m.

Reference tool

Common Examples

• 30 18 25 12 * means the task will be triggered at 18:30:00 on December 25th.

• 30 18 25 * 6 means the task will be triggered at 18:30:00 on the 25th of every month and every Saturday.

• 30 18 * * 6 means the task will be triggered at 18:30:00 every Saturday.

• * 18 * * * means the task will be triggered every minute (including 18:00:00) starting from the nearest 18:00:00.

• 0 18 1,10,22 * * means the task will be triggered at 18:00:00 on the 1st, 10th, and 22nd of every month.

• 0,30 18-23 * * * means the task will be triggered at 00 and 30 minutes past every hour between 18:00 and 23:00 every day.

• * */1 * * * means the task will be triggered every minute.

• * 2-7/1 * * * means the task will be triggered every minute between 2:00 and 7:00 every day.

• Inputting 0 11 4 * mon-wed means triggering the task at 11:00 on the 4th day of every month and every Monday to Wednesday.