Fields:

1) minute of the hour, 00-59
2) hour of the day, 00-32 (military time)
3) day of the month, 1-31
4) month of the year, 1-12
5) day of the week, 0-6 with 0=Sunday

Examples:

# MIN HOUR DAY MONTH DAYOFWEEK
# at 6:10 a.m. every day
10 6 * * *

# every two hours at the top of the hour
0 */2 * * *

# every two hours from 11p.m. to 7a.m., and at 8a.m.
0 23-7/2,8 * * *

# at 11:00 a.m. on the 4th and on every mon, tue, wed
0 11 4 * 1-3

# 4:00 a.m. on january 1st
0 4 1 1 *