breakitdown / Cron / 0 0 */2 * * 0 0 */2 * * — every other day, almost
Answer 0 0 */2 * * runs at midnight on the 1st, 3rd, 5th … of each month: the odd-numbered days. After a 31-day month it runs on the 31st and again on the 1st, two days in a row.
0Minute 0Hour */2Day of month *Month *Day of week
At 00:00 on every 2nd day of the month (1, 3, 5, 7, … 31).
A day field that starts with '*' (like */2) counts as unrestricted for cron's either/or day rule, so the two day fields are combined with AND here. Some libraries (croniter, for one) treat it differently.
0Minute (0-59) At minute 0 (on the hour)
0Hour (0-23) Hour 0 (midnight, 00:00–00:59)
*/2Day of month (1-31) Every 2nd day starting at 1: 1, 3, 5, 7, … 31. Months are not a multiple of 2 days long, so the pattern restarts on the 1st of each month (the 31st and the 1st can run back to back)
*Month (1-12 or JAN-DEC) Every month
*Day of week (0-7 or SUN-SAT (0 and 7 = Sunday)) Every day (no restriction)
Next 10 runs in UTC 1 00:00 Sun, 1 Nov 2026in 3 hours 2 00:00 Tue, 3 Nov 2026in 2 days 3 00:00 Thu, 5 Nov 2026in 4 days 4 00:00 Sat, 7 Nov 2026in 6 days 5 00:00 Mon, 9 Nov 2026in 8 days 6 00:00 Wed, 11 Nov 2026in 10 days 7 00:00 Fri, 13 Nov 2026in 12 days 8 00:00 Sun, 15 Nov 2026in 14 days 9 00:00 Tue, 17 Nov 2026in 16 days 10 00:00 Thu, 19 Nov 2026in 18 days When it fires 0.51 runs a day on average3.6 a week186 of the next 364 days have a run
Hours of the week (darker = more runs) 00 03 06 09 12 15 18 21 Mon Mon 00:00-00:59: 26 runs over the next 364 days Mon 01:00-01:59: 0 runs over the next 364 days Mon 02:00-02:59: 0 runs over the next 364 days Mon 03:00-03:59: 0 runs over the next 364 days Mon 04:00-04:59: 0 runs over the next 364 days Mon 05:00-05:59: 0 runs over the next 364 days Mon 06:00-06:59: 0 runs over the next 364 days Mon 07:00-07:59: 0 runs over the next 364 days Mon 08:00-08:59: 0 runs over the next 364 days Mon 09:00-09:59: 0 runs over the next 364 days Mon 10:00-10:59: 0 runs over the next 364 days Mon 11:00-11:59: 0 runs over the next 364 days Mon 12:00-12:59: 0 runs over the next 364 days Mon 13:00-13:59: 0 runs over the next 364 days Mon 14:00-14:59: 0 runs over the next 364 days Mon 15:00-15:59: 0 runs over the next 364 days Mon 16:00-16:59: 0 runs over the next 364 days Mon 17:00-17:59: 0 runs over the next 364 days Mon 18:00-18:59: 0 runs over the next 364 days Mon 19:00-19:59: 0 runs over the next 364 days Mon 20:00-20:59: 0 runs over the next 364 days Mon 21:00-21:59: 0 runs over the next 364 days Mon 22:00-22:59: 0 runs over the next 364 days Mon 23:00-23:59: 0 runs over the next 364 days Tue Tue 00:00-00:59: 27 runs over the next 364 days Tue 01:00-01:59: 0 runs over the next 364 days Tue 02:00-02:59: 0 runs over the next 364 days Tue 03:00-03:59: 0 runs over the next 364 days Tue 04:00-04:59: 0 runs over the next 364 days Tue 05:00-05:59: 0 runs over the next 364 days Tue 06:00-06:59: 0 runs over the next 364 days Tue 07:00-07:59: 0 runs over the next 364 days Tue 08:00-08:59: 0 runs over the next 364 days Tue 09:00-09:59: 0 runs over the next 364 days Tue 10:00-10:59: 0 runs over the next 364 days Tue 11:00-11:59: 0 runs over the next 364 days Tue 12:00-12:59: 0 runs over the next 364 days Tue 13:00-13:59: 0 runs over the next 364 days Tue 14:00-14:59: 0 runs over the next 364 days Tue 15:00-15:59: 0 runs over the next 364 days Tue 16:00-16:59: 0 runs over the next 364 days Tue 17:00-17:59: 0 runs over the next 364 days Tue 18:00-18:59: 0 runs over the next 364 days Tue 19:00-19:59: 0 runs over the next 364 days Tue 20:00-20:59: 0 runs over the next 364 days Tue 21:00-21:59: 0 runs over the next 364 days Tue 22:00-22:59: 0 runs over the next 364 days Tue 23:00-23:59: 0 runs over the next 364 days Wed Wed 00:00-00:59: 26 runs over the next 364 days Wed 01:00-01:59: 0 runs over the next 364 days Wed 02:00-02:59: 0 runs over the next 364 days Wed 03:00-03:59: 0 runs over the next 364 days Wed 04:00-04:59: 0 runs over the next 364 days Wed 05:00-05:59: 0 runs over the next 364 days Wed 06:00-06:59: 0 runs over the next 364 days Wed 07:00-07:59: 0 runs over the next 364 days Wed 08:00-08:59: 0 runs over the next 364 days Wed 09:00-09:59: 0 runs over the next 364 days Wed 10:00-10:59: 0 runs over the next 364 days Wed 11:00-11:59: 0 runs over the next 364 days Wed 12:00-12:59: 0 runs over the next 364 days Wed 13:00-13:59: 0 runs over the next 364 days Wed 14:00-14:59: 0 runs over the next 364 days Wed 15:00-15:59: 0 runs over the next 364 days Wed 16:00-16:59: 0 runs over the next 364 days Wed 17:00-17:59: 0 runs over the next 364 days Wed 18:00-18:59: 0 runs over the next 364 days Wed 19:00-19:59: 0 runs over the next 364 days Wed 20:00-20:59: 0 runs over the next 364 days Wed 21:00-21:59: 0 runs over the next 364 days Wed 22:00-22:59: 0 runs over the next 364 days Wed 23:00-23:59: 0 runs over the next 364 days Thu Thu 00:00-00:59: 27 runs over the next 364 days Thu 01:00-01:59: 0 runs over the next 364 days Thu 02:00-02:59: 0 runs over the next 364 days Thu 03:00-03:59: 0 runs over the next 364 days Thu 04:00-04:59: 0 runs over the next 364 days Thu 05:00-05:59: 0 runs over the next 364 days Thu 06:00-06:59: 0 runs over the next 364 days Thu 07:00-07:59: 0 runs over the next 364 days Thu 08:00-08:59: 0 runs over the next 364 days Thu 09:00-09:59: 0 runs over the next 364 days Thu 10:00-10:59: 0 runs over the next 364 days Thu 11:00-11:59: 0 runs over the next 364 days Thu 12:00-12:59: 0 runs over the next 364 days Thu 13:00-13:59: 0 runs over the next 364 days Thu 14:00-14:59: 0 runs over the next 364 days Thu 15:00-15:59: 0 runs over the next 364 days Thu 16:00-16:59: 0 runs over the next 364 days Thu 17:00-17:59: 0 runs over the next 364 days Thu 18:00-18:59: 0 runs over the next 364 days Thu 19:00-19:59: 0 runs over the next 364 days Thu 20:00-20:59: 0 runs over the next 364 days Thu 21:00-21:59: 0 runs over the next 364 days Thu 22:00-22:59: 0 runs over the next 364 days Thu 23:00-23:59: 0 runs over the next 364 days Fri Fri 00:00-00:59: 26 runs over the next 364 days Fri 01:00-01:59: 0 runs over the next 364 days Fri 02:00-02:59: 0 runs over the next 364 days Fri 03:00-03:59: 0 runs over the next 364 days Fri 04:00-04:59: 0 runs over the next 364 days Fri 05:00-05:59: 0 runs over the next 364 days Fri 06:00-06:59: 0 runs over the next 364 days Fri 07:00-07:59: 0 runs over the next 364 days Fri 08:00-08:59: 0 runs over the next 364 days Fri 09:00-09:59: 0 runs over the next 364 days Fri 10:00-10:59: 0 runs over the next 364 days Fri 11:00-11:59: 0 runs over the next 364 days Fri 12:00-12:59: 0 runs over the next 364 days Fri 13:00-13:59: 0 runs over the next 364 days Fri 14:00-14:59: 0 runs over the next 364 days Fri 15:00-15:59: 0 runs over the next 364 days Fri 16:00-16:59: 0 runs over the next 364 days Fri 17:00-17:59: 0 runs over the next 364 days Fri 18:00-18:59: 0 runs over the next 364 days Fri 19:00-19:59: 0 runs over the next 364 days Fri 20:00-20:59: 0 runs over the next 364 days Fri 21:00-21:59: 0 runs over the next 364 days Fri 22:00-22:59: 0 runs over the next 364 days Fri 23:00-23:59: 0 runs over the next 364 days Sat Sat 00:00-00:59: 27 runs over the next 364 days Sat 01:00-01:59: 0 runs over the next 364 days Sat 02:00-02:59: 0 runs over the next 364 days Sat 03:00-03:59: 0 runs over the next 364 days Sat 04:00-04:59: 0 runs over the next 364 days Sat 05:00-05:59: 0 runs over the next 364 days Sat 06:00-06:59: 0 runs over the next 364 days Sat 07:00-07:59: 0 runs over the next 364 days Sat 08:00-08:59: 0 runs over the next 364 days Sat 09:00-09:59: 0 runs over the next 364 days Sat 10:00-10:59: 0 runs over the next 364 days Sat 11:00-11:59: 0 runs over the next 364 days Sat 12:00-12:59: 0 runs over the next 364 days Sat 13:00-13:59: 0 runs over the next 364 days Sat 14:00-14:59: 0 runs over the next 364 days Sat 15:00-15:59: 0 runs over the next 364 days Sat 16:00-16:59: 0 runs over the next 364 days Sat 17:00-17:59: 0 runs over the next 364 days Sat 18:00-18:59: 0 runs over the next 364 days Sat 19:00-19:59: 0 runs over the next 364 days Sat 20:00-20:59: 0 runs over the next 364 days Sat 21:00-21:59: 0 runs over the next 364 days Sat 22:00-22:59: 0 runs over the next 364 days Sat 23:00-23:59: 0 runs over the next 364 days Sun Sun 00:00-00:59: 27 runs over the next 364 days Sun 01:00-01:59: 0 runs over the next 364 days Sun 02:00-02:59: 0 runs over the next 364 days Sun 03:00-03:59: 0 runs over the next 364 days Sun 04:00-04:59: 0 runs over the next 364 days Sun 05:00-05:59: 0 runs over the next 364 days Sun 06:00-06:59: 0 runs over the next 364 days Sun 07:00-07:59: 0 runs over the next 364 days Sun 08:00-08:59: 0 runs over the next 364 days Sun 09:00-09:59: 0 runs over the next 364 days Sun 10:00-10:59: 0 runs over the next 364 days Sun 11:00-11:59: 0 runs over the next 364 days Sun 12:00-12:59: 0 runs over the next 364 days Sun 13:00-13:59: 0 runs over the next 364 days Sun 14:00-14:59: 0 runs over the next 364 days Sun 15:00-15:59: 0 runs over the next 364 days Sun 16:00-16:59: 0 runs over the next 364 days Sun 17:00-17:59: 0 runs over the next 364 days Sun 18:00-18:59: 0 runs over the next 364 days Sun 19:00-19:59: 0 runs over the next 364 days Sun 20:00-20:59: 0 runs over the next 364 days Sun 21:00-21:59: 0 runs over the next 364 days Sun 22:00-22:59: 0 runs over the next 364 days Sun 23:00-23:59: 0 runs over the next 364 days
The next 52 weeks, one square per day Mon Wed Fri Oct Sat 31 Oct 2026: 1 run Sun 1 Nov 2026: 1 run Mon 2 Nov 2026: 0 runs Tue 3 Nov 2026: 1 run Wed 4 Nov 2026: 0 runs Thu 5 Nov 2026: 1 run Fri 6 Nov 2026: 0 runs Sat 7 Nov 2026: 1 run Sun 8 Nov 2026: 0 runs Mon 9 Nov 2026: 1 run Tue 10 Nov 2026: 0 runs Wed 11 Nov 2026: 1 run Thu 12 Nov 2026: 0 runs Fri 13 Nov 2026: 1 run Sat 14 Nov 2026: 0 runs Sun 15 Nov 2026: 1 run Mon 16 Nov 2026: 0 runs Tue 17 Nov 2026: 1 run Wed 18 Nov 2026: 0 runs Thu 19 Nov 2026: 1 run Fri 20 Nov 2026: 0 runs Sat 21 Nov 2026: 1 run Sun 22 Nov 2026: 0 runs Mon 23 Nov 2026: 1 run Tue 24 Nov 2026: 0 runs Wed 25 Nov 2026: 1 run Thu 26 Nov 2026: 0 runs Fri 27 Nov 2026: 1 run Sat 28 Nov 2026: 0 runs Sun 29 Nov 2026: 1 run Mon 30 Nov 2026: 0 runs Dec Tue 1 Dec 2026: 1 run Wed 2 Dec 2026: 0 runs Thu 3 Dec 2026: 1 run Fri 4 Dec 2026: 0 runs Sat 5 Dec 2026: 1 run Sun 6 Dec 2026: 0 runs Mon 7 Dec 2026: 1 run Tue 8 Dec 2026: 0 runs Wed 9 Dec 2026: 1 run Thu 10 Dec 2026: 0 runs Fri 11 Dec 2026: 1 run Sat 12 Dec 2026: 0 runs Sun 13 Dec 2026: 1 run Mon 14 Dec 2026: 0 runs Tue 15 Dec 2026: 1 run Wed 16 Dec 2026: 0 runs Thu 17 Dec 2026: 1 run Fri 18 Dec 2026: 0 runs Sat 19 Dec 2026: 1 run Sun 20 Dec 2026: 0 runs Mon 21 Dec 2026: 1 run Tue 22 Dec 2026: 0 runs Wed 23 Dec 2026: 1 run Thu 24 Dec 2026: 0 runs Fri 25 Dec 2026: 1 run Sat 26 Dec 2026: 0 runs Sun 27 Dec 2026: 1 run Mon 28 Dec 2026: 0 runs Tue 29 Dec 2026: 1 run Wed 30 Dec 2026: 0 runs Thu 31 Dec 2026: 1 run Jan Fri 1 Jan 2027: 1 run Sat 2 Jan 2027: 0 runs Sun 3 Jan 2027: 1 run Mon 4 Jan 2027: 0 runs Tue 5 Jan 2027: 1 run Wed 6 Jan 2027: 0 runs Thu 7 Jan 2027: 1 run Fri 8 Jan 2027: 0 runs Sat 9 Jan 2027: 1 run Sun 10 Jan 2027: 0 runs Mon 11 Jan 2027: 1 run Tue 12 Jan 2027: 0 runs Wed 13 Jan 2027: 1 run Thu 14 Jan 2027: 0 runs Fri 15 Jan 2027: 1 run Sat 16 Jan 2027: 0 runs Sun 17 Jan 2027: 1 run Mon 18 Jan 2027: 0 runs Tue 19 Jan 2027: 1 run Wed 20 Jan 2027: 0 runs Thu 21 Jan 2027: 1 run Fri 22 Jan 2027: 0 runs Sat 23 Jan 2027: 1 run Sun 24 Jan 2027: 0 runs Mon 25 Jan 2027: 1 run Tue 26 Jan 2027: 0 runs Wed 27 Jan 2027: 1 run Thu 28 Jan 2027: 0 runs Fri 29 Jan 2027: 1 run Sat 30 Jan 2027: 0 runs Sun 31 Jan 2027: 1 run Feb Mon 1 Feb 2027: 1 run Tue 2 Feb 2027: 0 runs Wed 3 Feb 2027: 1 run Thu 4 Feb 2027: 0 runs Fri 5 Feb 2027: 1 run Sat 6 Feb 2027: 0 runs Sun 7 Feb 2027: 1 run Mon 8 Feb 2027: 0 runs Tue 9 Feb 2027: 1 run Wed 10 Feb 2027: 0 runs Thu 11 Feb 2027: 1 run Fri 12 Feb 2027: 0 runs Sat 13 Feb 2027: 1 run Sun 14 Feb 2027: 0 runs Mon 15 Feb 2027: 1 run Tue 16 Feb 2027: 0 runs Wed 17 Feb 2027: 1 run Thu 18 Feb 2027: 0 runs Fri 19 Feb 2027: 1 run Sat 20 Feb 2027: 0 runs Sun 21 Feb 2027: 1 run Mon 22 Feb 2027: 0 runs Tue 23 Feb 2027: 1 run Wed 24 Feb 2027: 0 runs Thu 25 Feb 2027: 1 run Fri 26 Feb 2027: 0 runs Sat 27 Feb 2027: 1 run Sun 28 Feb 2027: 0 runs Mar Mon 1 Mar 2027: 1 run Tue 2 Mar 2027: 0 runs Wed 3 Mar 2027: 1 run Thu 4 Mar 2027: 0 runs Fri 5 Mar 2027: 1 run Sat 6 Mar 2027: 0 runs Sun 7 Mar 2027: 1 run Mon 8 Mar 2027: 0 runs Tue 9 Mar 2027: 1 run Wed 10 Mar 2027: 0 runs Thu 11 Mar 2027: 1 run Fri 12 Mar 2027: 0 runs Sat 13 Mar 2027: 1 run Sun 14 Mar 2027: 0 runs Mon 15 Mar 2027: 1 run Tue 16 Mar 2027: 0 runs Wed 17 Mar 2027: 1 run Thu 18 Mar 2027: 0 runs Fri 19 Mar 2027: 1 run Sat 20 Mar 2027: 0 runs Sun 21 Mar 2027: 1 run Mon 22 Mar 2027: 0 runs Tue 23 Mar 2027: 1 run Wed 24 Mar 2027: 0 runs Thu 25 Mar 2027: 1 run Fri 26 Mar 2027: 0 runs Sat 27 Mar 2027: 1 run Sun 28 Mar 2027: 0 runs Mon 29 Mar 2027: 1 run Tue 30 Mar 2027: 0 runs Wed 31 Mar 2027: 1 run Apr Thu 1 Apr 2027: 1 run Fri 2 Apr 2027: 0 runs Sat 3 Apr 2027: 1 run Sun 4 Apr 2027: 0 runs Mon 5 Apr 2027: 1 run Tue 6 Apr 2027: 0 runs Wed 7 Apr 2027: 1 run Thu 8 Apr 2027: 0 runs Fri 9 Apr 2027: 1 run Sat 10 Apr 2027: 0 runs Sun 11 Apr 2027: 1 run Mon 12 Apr 2027: 0 runs Tue 13 Apr 2027: 1 run Wed 14 Apr 2027: 0 runs Thu 15 Apr 2027: 1 run Fri 16 Apr 2027: 0 runs Sat 17 Apr 2027: 1 run Sun 18 Apr 2027: 0 runs Mon 19 Apr 2027: 1 run Tue 20 Apr 2027: 0 runs Wed 21 Apr 2027: 1 run Thu 22 Apr 2027: 0 runs Fri 23 Apr 2027: 1 run Sat 24 Apr 2027: 0 runs Sun 25 Apr 2027: 1 run Mon 26 Apr 2027: 0 runs Tue 27 Apr 2027: 1 run Wed 28 Apr 2027: 0 runs Thu 29 Apr 2027: 1 run Fri 30 Apr 2027: 0 runs May Sat 1 May 2027: 1 run Sun 2 May 2027: 0 runs Mon 3 May 2027: 1 run Tue 4 May 2027: 0 runs Wed 5 May 2027: 1 run Thu 6 May 2027: 0 runs Fri 7 May 2027: 1 run Sat 8 May 2027: 0 runs Sun 9 May 2027: 1 run Mon 10 May 2027: 0 runs Tue 11 May 2027: 1 run Wed 12 May 2027: 0 runs Thu 13 May 2027: 1 run Fri 14 May 2027: 0 runs Sat 15 May 2027: 1 run Sun 16 May 2027: 0 runs Mon 17 May 2027: 1 run Tue 18 May 2027: 0 runs Wed 19 May 2027: 1 run Thu 20 May 2027: 0 runs Fri 21 May 2027: 1 run Sat 22 May 2027: 0 runs Sun 23 May 2027: 1 run Mon 24 May 2027: 0 runs Tue 25 May 2027: 1 run Wed 26 May 2027: 0 runs Thu 27 May 2027: 1 run Fri 28 May 2027: 0 runs Sat 29 May 2027: 1 run Sun 30 May 2027: 0 runs Mon 31 May 2027: 1 run Jun Tue 1 Jun 2027: 1 run Wed 2 Jun 2027: 0 runs Thu 3 Jun 2027: 1 run Fri 4 Jun 2027: 0 runs Sat 5 Jun 2027: 1 run Sun 6 Jun 2027: 0 runs Mon 7 Jun 2027: 1 run Tue 8 Jun 2027: 0 runs Wed 9 Jun 2027: 1 run Thu 10 Jun 2027: 0 runs Fri 11 Jun 2027: 1 run Sat 12 Jun 2027: 0 runs Sun 13 Jun 2027: 1 run Mon 14 Jun 2027: 0 runs Tue 15 Jun 2027: 1 run Wed 16 Jun 2027: 0 runs Thu 17 Jun 2027: 1 run Fri 18 Jun 2027: 0 runs Sat 19 Jun 2027: 1 run Sun 20 Jun 2027: 0 runs Mon 21 Jun 2027: 1 run Tue 22 Jun 2027: 0 runs Wed 23 Jun 2027: 1 run Thu 24 Jun 2027: 0 runs Fri 25 Jun 2027: 1 run Sat 26 Jun 2027: 0 runs Sun 27 Jun 2027: 1 run Mon 28 Jun 2027: 0 runs Tue 29 Jun 2027: 1 run Wed 30 Jun 2027: 0 runs Jul Thu 1 Jul 2027: 1 run Fri 2 Jul 2027: 0 runs Sat 3 Jul 2027: 1 run Sun 4 Jul 2027: 0 runs Mon 5 Jul 2027: 1 run Tue 6 Jul 2027: 0 runs Wed 7 Jul 2027: 1 run Thu 8 Jul 2027: 0 runs Fri 9 Jul 2027: 1 run Sat 10 Jul 2027: 0 runs Sun 11 Jul 2027: 1 run Mon 12 Jul 2027: 0 runs Tue 13 Jul 2027: 1 run Wed 14 Jul 2027: 0 runs Thu 15 Jul 2027: 1 run Fri 16 Jul 2027: 0 runs Sat 17 Jul 2027: 1 run Sun 18 Jul 2027: 0 runs Mon 19 Jul 2027: 1 run Tue 20 Jul 2027: 0 runs Wed 21 Jul 2027: 1 run Thu 22 Jul 2027: 0 runs Fri 23 Jul 2027: 1 run Sat 24 Jul 2027: 0 runs Sun 25 Jul 2027: 1 run Mon 26 Jul 2027: 0 runs Tue 27 Jul 2027: 1 run Wed 28 Jul 2027: 0 runs Thu 29 Jul 2027: 1 run Fri 30 Jul 2027: 0 runs Sat 31 Jul 2027: 1 run Aug Sun 1 Aug 2027: 1 run Mon 2 Aug 2027: 0 runs Tue 3 Aug 2027: 1 run Wed 4 Aug 2027: 0 runs Thu 5 Aug 2027: 1 run Fri 6 Aug 2027: 0 runs Sat 7 Aug 2027: 1 run Sun 8 Aug 2027: 0 runs Mon 9 Aug 2027: 1 run Tue 10 Aug 2027: 0 runs Wed 11 Aug 2027: 1 run Thu 12 Aug 2027: 0 runs Fri 13 Aug 2027: 1 run Sat 14 Aug 2027: 0 runs Sun 15 Aug 2027: 1 run Mon 16 Aug 2027: 0 runs Tue 17 Aug 2027: 1 run Wed 18 Aug 2027: 0 runs Thu 19 Aug 2027: 1 run Fri 20 Aug 2027: 0 runs Sat 21 Aug 2027: 1 run Sun 22 Aug 2027: 0 runs Mon 23 Aug 2027: 1 run Tue 24 Aug 2027: 0 runs Wed 25 Aug 2027: 1 run Thu 26 Aug 2027: 0 runs Fri 27 Aug 2027: 1 run Sat 28 Aug 2027: 0 runs Sun 29 Aug 2027: 1 run Mon 30 Aug 2027: 0 runs Tue 31 Aug 2027: 1 run Sep Wed 1 Sep 2027: 1 run Thu 2 Sep 2027: 0 runs Fri 3 Sep 2027: 1 run Sat 4 Sep 2027: 0 runs Sun 5 Sep 2027: 1 run Mon 6 Sep 2027: 0 runs Tue 7 Sep 2027: 1 run Wed 8 Sep 2027: 0 runs Thu 9 Sep 2027: 1 run Fri 10 Sep 2027: 0 runs Sat 11 Sep 2027: 1 run Sun 12 Sep 2027: 0 runs Mon 13 Sep 2027: 1 run Tue 14 Sep 2027: 0 runs Wed 15 Sep 2027: 1 run Thu 16 Sep 2027: 0 runs Fri 17 Sep 2027: 1 run Sat 18 Sep 2027: 0 runs Sun 19 Sep 2027: 1 run Mon 20 Sep 2027: 0 runs Tue 21 Sep 2027: 1 run Wed 22 Sep 2027: 0 runs Thu 23 Sep 2027: 1 run Fri 24 Sep 2027: 0 runs Sat 25 Sep 2027: 1 run Sun 26 Sep 2027: 0 runs Mon 27 Sep 2027: 1 run Tue 28 Sep 2027: 0 runs Wed 29 Sep 2027: 1 run Thu 30 Sep 2027: 0 runs Oct Fri 1 Oct 2027: 1 run Sat 2 Oct 2027: 0 runs Sun 3 Oct 2027: 1 run Mon 4 Oct 2027: 0 runs Tue 5 Oct 2027: 1 run Wed 6 Oct 2027: 0 runs Thu 7 Oct 2027: 1 run Fri 8 Oct 2027: 0 runs Sat 9 Oct 2027: 1 run Sun 10 Oct 2027: 0 runs Mon 11 Oct 2027: 1 run Tue 12 Oct 2027: 0 runs Wed 13 Oct 2027: 1 run Thu 14 Oct 2027: 0 runs Fri 15 Oct 2027: 1 run Sat 16 Oct 2027: 0 runs Sun 17 Oct 2027: 1 run Mon 18 Oct 2027: 0 runs Tue 19 Oct 2027: 1 run Wed 20 Oct 2027: 0 runs Thu 21 Oct 2027: 1 run Fri 22 Oct 2027: 0 runs Sat 23 Oct 2027: 1 run Sun 24 Oct 2027: 0 runs Mon 25 Oct 2027: 1 run Tue 26 Oct 2027: 0 runs Wed 27 Oct 2027: 1 run Thu 28 Oct 2027: 0 runs Fri 29 Oct 2027: 1 run
What to know A day-of-month step restarts every month, so it cannot keep a strict 48-hour rhythm. For that, run daily and let the script exit on alternate days, for example by checking whether the day number since the epoch is even: [ $(( $(date +\%s) / 86400 \% 2 )) -eq 0 ] && cmd.
Variations
0 0 2-30/2 * *even-numbered days instead At 00:00 on day 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 and 30 of the month.
Gotchas Combined with a weekday, a field starting with * changes the either/or rule: 0 0 */2 * 1 runs only on odd-numbered days that are also Mondays (in Vixie cron and cronie). % must be escaped as \% inside a crontab line.← Explain any cron expression
