Example. Files made in 2022-03-04, 2022-04-20, and 2022-04-22 produce
y 2022: 3
mm 2022-03: 1
ddd 2022-03-04: 1
mm 2022-04: 2
ddd 2022-04-20: 1
ddd 2022-04-22: 1
Thus the number of files from each year, month, or day is easily visible.
March 04 2022 05:26:26.20220304 April 19 2023 10:24:37.20230419 November 13 2024 21:59:54.20241113 April 22 2022 06:16:57.20220422 November 13 2024 22:33:06.20241113 April 19 2023 07:43:12.20230419 April 19 2023 10:25:19.20230419 April 20 2022 13:06:31.20220420 November 13 2024 22:08:05.20241113 April 22 2022 06:18:16.20220422 April 19 2023 10:29:40.20230419 April 16 2023 07:58:10.20230416 November 13 2024 22:20:28.20241113 April 20 2022 13:03:59.20220420 March 04 2022 05:26:26.20220304 February 05 2023 05:43:01.20230205 April 19 2023 10:24:37.20230419 November 13 2024 21:52:24.20241113 array(3) { [2022]=> array(3) { [0]=> int(6) ["03"]=> array(2) { [0]=> int(2) ["04"]=> array(1) { [0]=> int(2) } } ["04"]=> array(3) { [0]=> int(4) [22]=> array(1) { [0]=> int(2) } [20]=> array(1) { [0]=> int(2) } } } [2023]=> array(3) { [0]=> int(7) ["04"]=> array(3) { [0]=> int(6) [19]=> array(1) { [0]=> int(5) } [16]=> array(1) { [0]=> int(1) } } ["02"]=> array(2) { [0]=> int(1) ["05"]=> array(1) { [0]=> int(1) } } } [2024]=> array(2) { [0]=> int(5) [11]=> array(2) { [0]=> int(5) [13]=> array(1) { [0]=> int(5) } } } }