CronSandbox
For an offline exploration of crontab expressions
Processing . . .
Enter the timing operators for a crontab parameter string, and click 'Run'.
You will see a list of the dates and times that your cron job would execute.
'Run' an empty box to return to the start-up demonstration values.


Reminder of the format... mm hh D M DoW
mm - the minute, a value between 0 and 59
hh - the hour, a value between 0 and 23
D - day of the month, between 1 and 31
M - month, a value between 1 and 12
DoW - day-of-the-week, 0-6 (0 = Sunday)

Each of the five items can be more complex...
A '*' means use all values.
Multiples: e.g. every 20 mins would be '0,20,40'.
Range: e.g. hourly in the evening '19-23'.
Every nth '0-23/n', '*/2' would be every other.
'*/1' is generally acceptable elsewhere, but is flagged here as possibly an unintended entry.

Month can be just the first three letters of the name,
so 'mar,jun,sep,dec' or '3,6,9,12' or '3-12/3'
would all give you quarterly reports.

The DoW can also be e.g. 'mon,wed,fri'.
It is DoW OR DoM (rather than DoW AND DoM), so e.g.
'11th OR a Tuesday' rather than '11th AND a Tuesday'.


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Five items, space separated (mm hh D M DoW):

MinsHrsDayMthDoW
0523**mon,wed,fri
This run time (UTC) Wed2015-May-270128
Forward ScheduleWed2015-May-272305
Fri2015-May-292305
Mon2015-Jun-012305
Wed2015-Jun-032305
Fri2015-Jun-052305
Mon2015-Jun-082305
Wed2015-Jun-102305
Fri2015-Jun-122305
Mon2015-Jun-152305
Wed2015-Jun-172305
Fri2015-Jun-192305
Mon2015-Jun-222305
Wed2015-Jun-242305
Fri2015-Jun-262305
Mon2015-Jun-292305
Wed2015-Jul-012305
Fri2015-Jul-032305
Mon2015-Jul-062305
Wed2015-Jul-082305
Fri2015-Jul-102305