crontab.guru – the cron schedule expression editor

An easy to use editor for crontab schedules.

Source: crontab.guru – the cron schedule expression editor

1 8 4 * *
“At 08:01 on the 4th of every month.”
next at 2016-09-04 08:01
random

[minute] [hour] [date] [month] [weekday]

* 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)

More info here:

https://en.wikipedia.org/wiki/Cron