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) Fri2015-Sep-042307
Forward ScheduleMon2015-Sep-072305
Wed2015-Sep-092305
Fri2015-Sep-112305
Mon2015-Sep-142305
Wed2015-Sep-162305
Fri2015-Sep-182305
Mon2015-Sep-212305
Wed2015-Sep-232305
Fri2015-Sep-252305
Mon2015-Sep-282305
Wed2015-Sep-302305
Fri2015-Oct-022305
Mon2015-Oct-052305
Wed2015-Oct-072305
Fri2015-Oct-092305
Mon2015-Oct-122305
Wed2015-Oct-142305
Fri2015-Oct-162305
Mon2015-Oct-192305
Wed2015-Oct-212305