breakitdown / Cron / 0 9 1-7 * 1 The first Monday of the month in cron
Answer 0 9 1-7 * 1 does NOT mean the first Monday. When both day fields are set, cron runs on days matching either one, so this runs on the 1st to the 7th and also on every Monday. Use 0 9 1-7 * * and test the weekday in the command: [ "$(date +\%u)" = 1 ] && cmd.
0Minute 9Hour 1-7Day of month *Month 1Day of week
At 09:00 on day 1–7 of the month or on Monday.
Both day fields are restricted, so cron runs on days matching EITHER (day of month 1-7) OR (day of week 1), not both. This surprises almost everyone.
0Minute (0-59) At minute 0 (on the hour)
9Hour (0-23) Hour 9 (09:00–09:59)
1-7Day of month (1-31) 1 through 7
*Month (1-12 or JAN-DEC) Every month
1Day of week (0-7 or SUN-SAT (0 and 7 = Sunday)) Monday
Next 10 runs in UTC 1 09:00 Sun, 1 Nov 2026in 12 hours 2 09:00 Mon, 2 Nov 2026in 1 day 3 09:00 Tue, 3 Nov 2026in 2 days 4 09:00 Wed, 4 Nov 2026in 3 days 5 09:00 Thu, 5 Nov 2026in 4 days 6 09:00 Fri, 6 Nov 2026in 5 days 7 09:00 Sat, 7 Nov 2026in 6 days 8 09:00 Mon, 9 Nov 2026in 8 days 9 09:00 Mon, 16 Nov 2026in 15 days 10 09:00 Mon, 23 Nov 2026in 22 days When it fires 0.34 runs a day on average2.4 a week124 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: 0 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: 52 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: 0 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: 12 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: 0 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: 12 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: 0 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: 12 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: 0 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: 12 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: 0 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: 12 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: 0 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: 12 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: 0 runs Sun 1 Nov 2026: 1 run Mon 2 Nov 2026: 1 run Tue 3 Nov 2026: 1 run Wed 4 Nov 2026: 1 run Thu 5 Nov 2026: 1 run Fri 6 Nov 2026: 1 run 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: 0 runs Thu 12 Nov 2026: 0 runs Fri 13 Nov 2026: 0 runs Sat 14 Nov 2026: 0 runs Sun 15 Nov 2026: 0 runs Mon 16 Nov 2026: 1 run Tue 17 Nov 2026: 0 runs Wed 18 Nov 2026: 0 runs Thu 19 Nov 2026: 0 runs Fri 20 Nov 2026: 0 runs Sat 21 Nov 2026: 0 runs Sun 22 Nov 2026: 0 runs Mon 23 Nov 2026: 1 run Tue 24 Nov 2026: 0 runs Wed 25 Nov 2026: 0 runs Thu 26 Nov 2026: 0 runs Fri 27 Nov 2026: 0 runs Sat 28 Nov 2026: 0 runs Sun 29 Nov 2026: 0 runs Mon 30 Nov 2026: 1 run Dec Tue 1 Dec 2026: 1 run Wed 2 Dec 2026: 1 run Thu 3 Dec 2026: 1 run Fri 4 Dec 2026: 1 run Sat 5 Dec 2026: 1 run Sun 6 Dec 2026: 1 run Mon 7 Dec 2026: 1 run Tue 8 Dec 2026: 0 runs Wed 9 Dec 2026: 0 runs Thu 10 Dec 2026: 0 runs Fri 11 Dec 2026: 0 runs Sat 12 Dec 2026: 0 runs Sun 13 Dec 2026: 0 runs Mon 14 Dec 2026: 1 run Tue 15 Dec 2026: 0 runs Wed 16 Dec 2026: 0 runs Thu 17 Dec 2026: 0 runs Fri 18 Dec 2026: 0 runs Sat 19 Dec 2026: 0 runs Sun 20 Dec 2026: 0 runs Mon 21 Dec 2026: 1 run Tue 22 Dec 2026: 0 runs Wed 23 Dec 2026: 0 runs Thu 24 Dec 2026: 0 runs Fri 25 Dec 2026: 0 runs Sat 26 Dec 2026: 0 runs Sun 27 Dec 2026: 0 runs Mon 28 Dec 2026: 1 run Tue 29 Dec 2026: 0 runs Wed 30 Dec 2026: 0 runs Thu 31 Dec 2026: 0 runs Jan Fri 1 Jan 2027: 1 run Sat 2 Jan 2027: 1 run Sun 3 Jan 2027: 1 run Mon 4 Jan 2027: 1 run Tue 5 Jan 2027: 1 run Wed 6 Jan 2027: 1 run Thu 7 Jan 2027: 1 run Fri 8 Jan 2027: 0 runs Sat 9 Jan 2027: 0 runs Sun 10 Jan 2027: 0 runs Mon 11 Jan 2027: 1 run Tue 12 Jan 2027: 0 runs Wed 13 Jan 2027: 0 runs Thu 14 Jan 2027: 0 runs Fri 15 Jan 2027: 0 runs Sat 16 Jan 2027: 0 runs Sun 17 Jan 2027: 0 runs Mon 18 Jan 2027: 1 run Tue 19 Jan 2027: 0 runs Wed 20 Jan 2027: 0 runs Thu 21 Jan 2027: 0 runs Fri 22 Jan 2027: 0 runs Sat 23 Jan 2027: 0 runs Sun 24 Jan 2027: 0 runs Mon 25 Jan 2027: 1 run Tue 26 Jan 2027: 0 runs Wed 27 Jan 2027: 0 runs Thu 28 Jan 2027: 0 runs Fri 29 Jan 2027: 0 runs Sat 30 Jan 2027: 0 runs Sun 31 Jan 2027: 0 runs Feb Mon 1 Feb 2027: 1 run Tue 2 Feb 2027: 1 run Wed 3 Feb 2027: 1 run Thu 4 Feb 2027: 1 run Fri 5 Feb 2027: 1 run Sat 6 Feb 2027: 1 run Sun 7 Feb 2027: 1 run Mon 8 Feb 2027: 1 run Tue 9 Feb 2027: 0 runs Wed 10 Feb 2027: 0 runs Thu 11 Feb 2027: 0 runs Fri 12 Feb 2027: 0 runs Sat 13 Feb 2027: 0 runs Sun 14 Feb 2027: 0 runs Mon 15 Feb 2027: 1 run Tue 16 Feb 2027: 0 runs Wed 17 Feb 2027: 0 runs Thu 18 Feb 2027: 0 runs Fri 19 Feb 2027: 0 runs Sat 20 Feb 2027: 0 runs Sun 21 Feb 2027: 0 runs Mon 22 Feb 2027: 1 run Tue 23 Feb 2027: 0 runs Wed 24 Feb 2027: 0 runs Thu 25 Feb 2027: 0 runs Fri 26 Feb 2027: 0 runs Sat 27 Feb 2027: 0 runs Sun 28 Feb 2027: 0 runs Mar Mon 1 Mar 2027: 1 run Tue 2 Mar 2027: 1 run Wed 3 Mar 2027: 1 run Thu 4 Mar 2027: 1 run Fri 5 Mar 2027: 1 run Sat 6 Mar 2027: 1 run Sun 7 Mar 2027: 1 run Mon 8 Mar 2027: 1 run Tue 9 Mar 2027: 0 runs Wed 10 Mar 2027: 0 runs Thu 11 Mar 2027: 0 runs Fri 12 Mar 2027: 0 runs Sat 13 Mar 2027: 0 runs Sun 14 Mar 2027: 0 runs Mon 15 Mar 2027: 1 run Tue 16 Mar 2027: 0 runs Wed 17 Mar 2027: 0 runs Thu 18 Mar 2027: 0 runs Fri 19 Mar 2027: 0 runs Sat 20 Mar 2027: 0 runs Sun 21 Mar 2027: 0 runs Mon 22 Mar 2027: 1 run Tue 23 Mar 2027: 0 runs Wed 24 Mar 2027: 0 runs Thu 25 Mar 2027: 0 runs Fri 26 Mar 2027: 0 runs Sat 27 Mar 2027: 0 runs Sun 28 Mar 2027: 0 runs Mon 29 Mar 2027: 1 run Tue 30 Mar 2027: 0 runs Wed 31 Mar 2027: 0 runs Apr Thu 1 Apr 2027: 1 run Fri 2 Apr 2027: 1 run Sat 3 Apr 2027: 1 run Sun 4 Apr 2027: 1 run Mon 5 Apr 2027: 1 run Tue 6 Apr 2027: 1 run Wed 7 Apr 2027: 1 run Thu 8 Apr 2027: 0 runs Fri 9 Apr 2027: 0 runs Sat 10 Apr 2027: 0 runs Sun 11 Apr 2027: 0 runs Mon 12 Apr 2027: 1 run Tue 13 Apr 2027: 0 runs Wed 14 Apr 2027: 0 runs Thu 15 Apr 2027: 0 runs Fri 16 Apr 2027: 0 runs Sat 17 Apr 2027: 0 runs Sun 18 Apr 2027: 0 runs Mon 19 Apr 2027: 1 run Tue 20 Apr 2027: 0 runs Wed 21 Apr 2027: 0 runs Thu 22 Apr 2027: 0 runs Fri 23 Apr 2027: 0 runs Sat 24 Apr 2027: 0 runs Sun 25 Apr 2027: 0 runs Mon 26 Apr 2027: 1 run Tue 27 Apr 2027: 0 runs Wed 28 Apr 2027: 0 runs Thu 29 Apr 2027: 0 runs Fri 30 Apr 2027: 0 runs May Sat 1 May 2027: 1 run Sun 2 May 2027: 1 run Mon 3 May 2027: 1 run Tue 4 May 2027: 1 run Wed 5 May 2027: 1 run Thu 6 May 2027: 1 run Fri 7 May 2027: 1 run Sat 8 May 2027: 0 runs Sun 9 May 2027: 0 runs Mon 10 May 2027: 1 run Tue 11 May 2027: 0 runs Wed 12 May 2027: 0 runs Thu 13 May 2027: 0 runs Fri 14 May 2027: 0 runs Sat 15 May 2027: 0 runs Sun 16 May 2027: 0 runs Mon 17 May 2027: 1 run Tue 18 May 2027: 0 runs Wed 19 May 2027: 0 runs Thu 20 May 2027: 0 runs Fri 21 May 2027: 0 runs Sat 22 May 2027: 0 runs Sun 23 May 2027: 0 runs Mon 24 May 2027: 1 run Tue 25 May 2027: 0 runs Wed 26 May 2027: 0 runs Thu 27 May 2027: 0 runs Fri 28 May 2027: 0 runs Sat 29 May 2027: 0 runs Sun 30 May 2027: 0 runs Mon 31 May 2027: 1 run Jun Tue 1 Jun 2027: 1 run Wed 2 Jun 2027: 1 run Thu 3 Jun 2027: 1 run Fri 4 Jun 2027: 1 run Sat 5 Jun 2027: 1 run Sun 6 Jun 2027: 1 run Mon 7 Jun 2027: 1 run Tue 8 Jun 2027: 0 runs Wed 9 Jun 2027: 0 runs Thu 10 Jun 2027: 0 runs Fri 11 Jun 2027: 0 runs Sat 12 Jun 2027: 0 runs Sun 13 Jun 2027: 0 runs Mon 14 Jun 2027: 1 run Tue 15 Jun 2027: 0 runs Wed 16 Jun 2027: 0 runs Thu 17 Jun 2027: 0 runs Fri 18 Jun 2027: 0 runs Sat 19 Jun 2027: 0 runs Sun 20 Jun 2027: 0 runs Mon 21 Jun 2027: 1 run Tue 22 Jun 2027: 0 runs Wed 23 Jun 2027: 0 runs Thu 24 Jun 2027: 0 runs Fri 25 Jun 2027: 0 runs Sat 26 Jun 2027: 0 runs Sun 27 Jun 2027: 0 runs Mon 28 Jun 2027: 1 run Tue 29 Jun 2027: 0 runs Wed 30 Jun 2027: 0 runs Jul Thu 1 Jul 2027: 1 run Fri 2 Jul 2027: 1 run Sat 3 Jul 2027: 1 run Sun 4 Jul 2027: 1 run Mon 5 Jul 2027: 1 run Tue 6 Jul 2027: 1 run Wed 7 Jul 2027: 1 run Thu 8 Jul 2027: 0 runs Fri 9 Jul 2027: 0 runs Sat 10 Jul 2027: 0 runs Sun 11 Jul 2027: 0 runs Mon 12 Jul 2027: 1 run Tue 13 Jul 2027: 0 runs Wed 14 Jul 2027: 0 runs Thu 15 Jul 2027: 0 runs Fri 16 Jul 2027: 0 runs Sat 17 Jul 2027: 0 runs Sun 18 Jul 2027: 0 runs Mon 19 Jul 2027: 1 run Tue 20 Jul 2027: 0 runs Wed 21 Jul 2027: 0 runs Thu 22 Jul 2027: 0 runs Fri 23 Jul 2027: 0 runs Sat 24 Jul 2027: 0 runs Sun 25 Jul 2027: 0 runs Mon 26 Jul 2027: 1 run Tue 27 Jul 2027: 0 runs Wed 28 Jul 2027: 0 runs Thu 29 Jul 2027: 0 runs Fri 30 Jul 2027: 0 runs Sat 31 Jul 2027: 0 runs Aug Sun 1 Aug 2027: 1 run Mon 2 Aug 2027: 1 run Tue 3 Aug 2027: 1 run Wed 4 Aug 2027: 1 run Thu 5 Aug 2027: 1 run Fri 6 Aug 2027: 1 run 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: 0 runs Thu 12 Aug 2027: 0 runs Fri 13 Aug 2027: 0 runs Sat 14 Aug 2027: 0 runs Sun 15 Aug 2027: 0 runs Mon 16 Aug 2027: 1 run Tue 17 Aug 2027: 0 runs Wed 18 Aug 2027: 0 runs Thu 19 Aug 2027: 0 runs Fri 20 Aug 2027: 0 runs Sat 21 Aug 2027: 0 runs Sun 22 Aug 2027: 0 runs Mon 23 Aug 2027: 1 run Tue 24 Aug 2027: 0 runs Wed 25 Aug 2027: 0 runs Thu 26 Aug 2027: 0 runs Fri 27 Aug 2027: 0 runs Sat 28 Aug 2027: 0 runs Sun 29 Aug 2027: 0 runs Mon 30 Aug 2027: 1 run Tue 31 Aug 2027: 0 runs Sep Wed 1 Sep 2027: 1 run Thu 2 Sep 2027: 1 run Fri 3 Sep 2027: 1 run Sat 4 Sep 2027: 1 run Sun 5 Sep 2027: 1 run Mon 6 Sep 2027: 1 run Tue 7 Sep 2027: 1 run Wed 8 Sep 2027: 0 runs Thu 9 Sep 2027: 0 runs Fri 10 Sep 2027: 0 runs Sat 11 Sep 2027: 0 runs Sun 12 Sep 2027: 0 runs Mon 13 Sep 2027: 1 run Tue 14 Sep 2027: 0 runs Wed 15 Sep 2027: 0 runs Thu 16 Sep 2027: 0 runs Fri 17 Sep 2027: 0 runs Sat 18 Sep 2027: 0 runs Sun 19 Sep 2027: 0 runs Mon 20 Sep 2027: 1 run Tue 21 Sep 2027: 0 runs Wed 22 Sep 2027: 0 runs Thu 23 Sep 2027: 0 runs Fri 24 Sep 2027: 0 runs Sat 25 Sep 2027: 0 runs Sun 26 Sep 2027: 0 runs Mon 27 Sep 2027: 1 run Tue 28 Sep 2027: 0 runs Wed 29 Sep 2027: 0 runs Thu 30 Sep 2027: 0 runs Oct Fri 1 Oct 2027: 1 run Sat 2 Oct 2027: 1 run Sun 3 Oct 2027: 1 run Mon 4 Oct 2027: 1 run Tue 5 Oct 2027: 1 run Wed 6 Oct 2027: 1 run Thu 7 Oct 2027: 1 run Fri 8 Oct 2027: 0 runs Sat 9 Oct 2027: 0 runs Sun 10 Oct 2027: 0 runs Mon 11 Oct 2027: 1 run Tue 12 Oct 2027: 0 runs Wed 13 Oct 2027: 0 runs Thu 14 Oct 2027: 0 runs Fri 15 Oct 2027: 0 runs Sat 16 Oct 2027: 0 runs Sun 17 Oct 2027: 0 runs Mon 18 Oct 2027: 1 run Tue 19 Oct 2027: 0 runs Wed 20 Oct 2027: 0 runs Thu 21 Oct 2027: 0 runs Fri 22 Oct 2027: 0 runs Sat 23 Oct 2027: 0 runs Sun 24 Oct 2027: 0 runs Mon 25 Oct 2027: 1 run Tue 26 Oct 2027: 0 runs Wed 27 Oct 2027: 0 runs Thu 28 Oct 2027: 0 runs Fri 29 Oct 2027: 0 runs
What to know This either/or rule is in POSIX and in every Vixie-derived cron. It only applies when both day fields are restricted: if either one is *, the other one alone decides.
Quartz, Spring and AWS EventBridge can say it directly with #: 0 0 9 ? * MON#1 is the first Monday at 09:00.
Variations
0 9 1-7 * *the Unix half of the fix: days 1-7, then test for Monday At 09:00 on day 1–7 of the month.
0 0 9 ? * MON#1Quartz/Spring/EventBridge-style: the first Monday At 09:00 on the 1st Monday of the month.
Gotchas The same trap catches "Friday the 13th": see 0 12 13 * 5 . date +%u gives 1 for Monday through 7 for Sunday; % must be written \% inside the crontab line.← Explain any cron expression
