| 2021/3/19(YY/MM/DD) WEEKNUMBER OF YEAR |
|
| A-TYPE ISO(janyary1) MONDAY START |
2021 week12 [3/15(MON)-3/21(SUN) |
| ★B-TYPE ISO(janyary4) ISO8601 STANDARD MONDAY START |
2021 week11 [3/15(MON)-3/21(SUN) |
| ★C-TYPE USA(january1) SUNDAY START |
2021 week12 [3/14(SUN)-3/20(SAT)] |
| D-TYPE USA(january4) SUNDAY START |
2021 week11 [3/14(SUN)-3/20(SAT)] |
| ★E-TYPE SAT(january1) SATURDAY START |
2021 week12 [3/13(SAT)-3/19(FRI) |
| 2021/3(USA) | |||||||
| SUN | MON | TUE | WED | THU | FRI | SAT | |
| ❶ | 1 | 2 | 3 | 4 | 5 | 6 | |
| ❷ | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| ❸ | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| ❹ | 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| ❺ | 28 | 29 | 30 | 31 | |||
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