Spreadsheet: 886706d1736809006-weeknum-and-isoweeknum-book1-weeknum
Sheet: Sheet1

Period | Wk | 2021 | 2022 | 2023 | 2024 | 2025
1 | 1 | 2021-01-04 00:00:00 | 2022-01-03 00:00:00 | 2023-01-02 00:00:00 | 2024-01-01 00:00:00 | 2025-01-06 00:00:00 |  |  |  |  |  |  | formula's | startday weeknum
 | 2 | 2021-01-11 00:00:00 | 2022-01-10 00:00:00 | 2023-01-09 00:00:00 | 2024-01-08 00:00:00 | 2025-01-13 00:00:00 |  | Date: |  |  |  |  |  | Sunday
 | 3 | 2021-01-18 00:00:00 | 2022-01-17 00:00:00 | 2023-01-16 00:00:00 | 2024-01-15 00:00:00 | 2025-01-20 00:00:00 |  | Wk Num: |  |  |  |  |  | Sunday
 | 4 | 2021-01-25 00:00:00 | 2022-01-24 00:00:00 | 2023-01-23 00:00:00 | 2024-01-22 00:00:00 | 2025-01-27 00:00:00 |  | Period Num: |  |  |  |  |  | Sunday
2 | 5 | 2021-02-01 00:00:00 | 2022-01-31 00:00:00 | 2023-01-30 00:00:00 | 2024-01-29 00:00:00 | 2025-02-03 00:00:00 |  |  |  |  |  |  |  | Monday
 | 6 | 2021-02-08 00:00:00 | 2022-02-07 00:00:00 | 2023-02-06 00:00:00 | 2024-02-05 00:00:00 | 2025-02-10 00:00:00 |  |  |  |  |  |  |  | Monday
 | 7 | 2021-02-15 00:00:00 | 2022-02-14 00:00:00 | 2023-02-13 00:00:00 | 2024-02-12 00:00:00 | 2025-02-17 00:00:00 |  |  |  |  |  |  |  | Tuesday
 | 8 | 2021-02-22 00:00:00 | 2022-02-21 00:00:00 | 2023-02-20 00:00:00 | 2024-02-19 00:00:00 | 2025-02-24 00:00:00 |  |  |  |  |  |  |  | Wednesday
3 | 9 | 2021-03-01 00:00:00 | 2022-02-28 00:00:00 | 2023-02-27 00:00:00 | 2024-02-26 00:00:00 | 2025-03-03 00:00:00 |  |  |  |  |  |  |  | Thursday
 | 10 | 2021-03-08 00:00:00 | 2022-03-07 00:00:00 | 2023-03-06 00:00:00 | 2024-03-04 00:00:00 | 2025-03-10 00:00:00 |  |  |  |  |  |  |  | Friday
 | 11 | 2021-03-15 00:00:00 | 2022-03-14 00:00:00 | 2023-03-13 00:00:00 | 2024-03-11 00:00:00 | 2025-03-17 00:00:00 |  |  |  |  |  |  |  | Saturday
 | 12 | 2021-03-22 00:00:00 | 2022-03-21 00:00:00 | 2023-03-20 00:00:00 | 2024-03-18 00:00:00 | 2025-03-24 00:00:00 |  |  |  |  |  |  |  | Sunday
4 | 13 | 2021-03-29 00:00:00 | 2022-03-28 00:00:00 | 2023-03-27 00:00:00 | 2024-03-25 00:00:00 | 2025-03-31 00:00:00 |  |  |  |  |  |  |  | Monday
 | 14 | 2021-04-05 00:00:00 | 2022-04-04 00:00:00 | 2023-04-03 00:00:00 | 2024-04-01 00:00:00 | 2025-04-07 00:00:00
 | 15 | 2021-04-12 00:00:00 | 2022-04-11 00:00:00 | 2023-04-10 00:00:00 | 2024-04-08 00:00:00 | 2025-04-14 00:00:00
 | 16 | 2021-04-19 00:00:00 | 2022-04-18 00:00:00 | 2023-04-17 00:00:00 | 2024-04-15 00:00:00 | 2025-04-21 00:00:00
5 | 17 | 2021-04-26 00:00:00 | 2022-04-25 00:00:00 | 2023-04-24 00:00:00 | 2024-04-22 00:00:00 | 2025-04-28 00:00:00
 | 18 | 2021-05-03 00:00:00 | 2022-05-02 00:00:00 | 2023-05-01 00:00:00 | 2024-04-29 00:00:00 | 2025-05-05 00:00:00
 | 19 | 2021-05-10 00:00:00 | 2022-05-09 00:00:00 | 2023-05-08 00:00:00 | 2024-05-06 00:00:00 | 2025-05-12 00:00:00
 | 20 | 2021-05-17 00:00:00 | 2022-05-16 00:00:00 | 2023-05-15 00:00:00 | 2024-05-13 00:00:00 | 2025-05-19 00:00:00
6 | 21 | 2021-05-24 00:00:00 | 2022-05-23 00:00:00 | 2023-05-22 00:00:00 | 2024-05-20 00:00:00 | 2025-05-26 00:00:00
 | 22 | 2021-05-31 00:00:00 | 2022-05-30 00:00:00 | 2023-05-29 00:00:00 | 2024-05-27 00:00:00 | 2025-06-02 00:00:00
 | 23 | 2021-06-07 00:00:00 | 2022-06-06 00:00:00 | 2023-06-05 00:00:00 | 2024-06-03 00:00:00 | 2025-06-09 00:00:00
 | 24 | 2021-06-14 00:00:00 | 2022-06-13 00:00:00 | 2023-06-12 00:00:00 | 2024-06-10 00:00:00 | 2025-06-16 00:00:00
7 | 25 | 2021-06-21 00:00:00 | 2022-06-20 00:00:00 | 2023-06-19 00:00:00 | 2024-06-17 00:00:00 | 2025-06-23 00:00:00
 | 26 | 2021-06-28 00:00:00 | 2022-06-27 00:00:00 | 2023-06-26 00:00:00 | 2024-06-24 00:00:00 | 2025-06-30 00:00:00
 | 27 | 2021-07-05 00:00:00 | 2022-07-04 00:00:00 | 2023-07-03 00:00:00 | 2024-07-01 00:00:00 | 2025-07-07 00:00:00
 | 28 | 2021-07-12 00:00:00 | 2022-07-11 00:00:00 | 2023-07-10 00:00:00 | 2024-07-08 00:00:00 | 2025-07-14 00:00:00
8 | 29 | 2021-07-19 00:00:00 | 2022-07-18 00:00:00 | 2023-07-17 00:00:00 | 2024-07-15 00:00:00 | 2025-07-21 00:00:00
 | 30 | 2021-07-26 00:00:00 | 2022-07-25 00:00:00 | 2023-07-24 00:00:00 | 2024-07-22 00:00:00 | 2025-07-28 00:00:00
 | 31 | 2021-08-02 00:00:00 | 2022-08-01 00:00:00 | 2023-07-31 00:00:00 | 2024-07-29 00:00:00 | 2025-08-04 00:00:00
 | 32 | 2021-08-09 00:00:00 | 2022-08-08 00:00:00 | 2023-08-07 00:00:00 | 2024-08-05 00:00:00 | 2025-08-11 00:00:00
9 | 33 | 2021-08-16 00:00:00 | 2022-08-15 00:00:00 | 2023-08-14 00:00:00 | 2024-08-12 00:00:00 | 2025-08-18 00:00:00
 | 34 | 2021-08-23 00:00:00 | 2022-08-22 00:00:00 | 2023-08-21 00:00:00 | 2024-08-19 00:00:00 | 2025-08-25 00:00:00
 | 35 | 2021-08-30 00:00:00 | 2022-08-29 00:00:00 | 2023-08-28 00:00:00 | 2024-08-26 00:00:00 | 2025-09-01 00:00:00
 | 36 | 2021-09-06 00:00:00 | 2022-09-05 00:00:00 | 2023-09-04 00:00:00 | 2024-09-02 00:00:00 | 2025-09-08 00:00:00
10 | 37 | 2021-09-13 00:00:00 | 2022-09-12 00:00:00 | 2023-09-11 00:00:00 | 2024-09-09 00:00:00 | 2025-09-15 00:00:00
 | 38 | 2021-09-20 00:00:00 | 2022-09-19 00:00:00 | 2023-09-18 00:00:00 | 2024-09-16 00:00:00 | 2025-09-22 00:00:00
 | 39 | 2021-09-27 00:00:00 | 2022-09-26 00:00:00 | 2023-09-25 00:00:00 | 2024-09-23 00:00:00 | 2025-09-29 00:00:00
 | 40 | 2021-10-04 00:00:00 | 2022-10-03 00:00:00 | 2023-10-02 00:00:00 | 2024-09-30 00:00:00 | 2025-10-06 00:00:00
11 | 41 | 2021-10-11 00:00:00 | 2022-10-10 00:00:00 | 2023-10-09 00:00:00 | 2024-10-07 00:00:00 | 2025-10-13 00:00:00
 | 42 | 2021-10-18 00:00:00 | 2022-10-17 00:00:00 | 2023-10-16 00:00:00 | 2024-10-14 00:00:00 | 2025-10-20 00:00:00
 | 43 | 2021-10-25 00:00:00 | 2022-10-24 00:00:00 | 2023-10-23 00:00:00 | 2024-10-21 00:00:00 | 2025-10-27 00:00:00
 | 44 | 2021-11-01 00:00:00 | 2022-10-31 00:00:00 | 2023-10-30 00:00:00 | 2024-10-28 00:00:00 | 2025-11-03 00:00:00
12 | 45 | 2021-11-08 00:00:00 | 2022-11-07 00:00:00 | 2023-11-06 00:00:00 | 2024-11-04 00:00:00 | 2025-11-10 00:00:00
 | 46 | 2021-11-15 00:00:00 | 2022-11-14 00:00:00 | 2023-11-13 00:00:00 | 2024-11-11 00:00:00 | 2025-11-17 00:00:00
 | 47 | 2021-11-22 00:00:00 | 2022-11-21 00:00:00 | 2023-11-20 00:00:00 | 2024-11-18 00:00:00 | 2025-11-24 00:00:00
 | 48 | 2021-11-29 00:00:00 | 2022-11-28 00:00:00 | 2023-11-27 00:00:00 | 2024-11-25 00:00:00 | 2025-12-01 00:00:00
13 | 49 | 2021-12-06 00:00:00 | 2022-12-05 00:00:00 | 2023-12-04 00:00:00 | 2024-12-02 00:00:00 | 2025-12-08 00:00:00
 | 50 | 2021-12-13 00:00:00 | 2022-12-12 00:00:00 | 2023-12-11 00:00:00 | 2024-12-09 00:00:00 | 2025-12-15 00:00:00
 | 51 | 2021-12-20 00:00:00 | 2022-12-19 00:00:00 | 2023-12-18 00:00:00 | 2024-12-16 00:00:00 | 2025-12-22 00:00:00
 | 52 | 2021-12-27 00:00:00 | 2022-12-26 00:00:00 | 2023-12-25 00:00:00 | 2024-12-23 00:00:00 | 2025-12-29 00:00:00
 | 53 |  |  |  | 2024-12-30 00:00:00