For those unfamiliar with “cron”, this means being able to create a firing schedule such as: “At 8:00am every Monday through Friday” or “At 1:30am every last Friday of the month”.
Examples
| Expression | Meaning |
|---|---|
| “0 0 12 * * ?” | Fire at 12pm (noon) every day |
| “0 15 10 ? * *” | Fire at 10:15am every day |
| “0 15 10 * * ?” | Fire at 10:15am every day |
| “0 15 10 * * ? *” | Fire at 10:15am every day |
| “0 15 10 * * ? 2005” | Fire at 10:15am every day during the year 2005 |
| “0 * 14 * * ?” | Fire every minute starting at 2pm and ending at 2:59pm, every day |
| “0 0/5 14,18 * * ?” | Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day |
| “0 0/5 14,18 * * ?” | Fire every 5 minutes starting at 2pm and ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending at 6:55pm, every day |
| “0 0-5 14 * * ?” | Fire every minute starting at 2 pm and ending at 2:05pm, every day |
| “0 10,44 14 ? 3 WED” | Fire at 2:10pm and at 2:44pm every Wednesday in the month of March |
| “0 15 10 ? * MON-FRI” | Fire at 10:15am every Monday, Tuesday, Wednesday, Thursday, and Friday |
| “0 15 10 15 * ?” | Fire at 10:15am on the 15th day of every month |
| “0 15 10 L * ?” | Fire at 10:15am on the last day of every month |
| “0 15 10 ? 6L” | Fire at 10:15am on the last Friday of every month |
| “0 15 10 ? * 6L 2002-2005” | Fire at 10:15am on every last Friday of every month during the years 2002, 2003, 2004, and 2005 |
| “0 15 10 ? * 6#3” | Fire at 10:15am on the third Friday of every month |
Pay attention to the effects of “?” and “*” in the day-of-week and day-of-month fields!
Note: Support for specifying both a day-of-week and a day-of-month value is not complete (you'll need to use the '?' character in one of these fields).
Be careful when setting fire times between midnight and 1:00am - “daylight savings” can cause a skip or a repeat depending on whether the time moves back or jumps forward.