The cron expression is made of five fields. Each field can have the following values.
* * * * * *
minute (0-59) second (0 - 59) hour (0 - 23) day of the month (1 - 31) month (1 - 12) day of the week (0 - 6)

Here are some example for you.
Cron expression Schedule
* * * * * Every minute
* * * * * * Every second
0 * * * * Every hour
0 0 * * * At 12:00 AM
0 0 * * FRI At 12:00 AM, only on Friday
0 0 1 * * At 12:00 AM, on day 1 of the month
0 23 ? * MON-FRI At 11:00 PM, Monday through Friday
* * * 6-8 * Every minute, July through September
23 12 * * SUN#2 At 12:23 PM, on the second Sunday of the month
0 0 1 */3 * At 12:00 AM, on day 1 of the month, every 3 months

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