random
Non standard! May not work with every cron.
minute
hour
day
(month)
month
day
(week)
*any value
,value list separator
-range of values
/step values
@yearly(non-standard)
@annually(non-standard)
@monthly(non-standard)
@weekly(non-standard)
@daily(non-standard)
@hourly(non-standard)
@reboot(non-standard)
0-59allowed values
0-23allowed values
1-31allowed values
1-12allowed values
JAN-DECalternative single values
0-6allowed values
SUN-SATalternative single values
7sunday (non-standard)