| 2004/4/1(YY/MM/DD) WEEKNUMBER OF YEAR | |
| A-TYPE ISO(janyary1) MONDAY START | 2004 week14 [3/29(MON)-4/4(SUN) | 
| ★B-TYPE ISO(janyary4) ISO8601 STANDARD MONDAY START | 2004 week14 [3/29(MON)-4/4(SUN) | 
| ★C-TYPE USA(january1) SUNDAY START | 2004 week14 [3/28(SUN)-4/3(SAT)] | 
| D-TYPE USA(january4) SUNDAY START | 2004 week13 [3/28(SUN)-4/3(SAT)] | 
| ★E-TYPE SAT(january1) SATURDAY START | 2004 week14 [3/27(SAT)-4/2(FRI) | 
| 2004/4(USA) | |||||||
| SUN | MON | TUE | WED | THU | FRI | SAT | |
| ❶ | 1 | 2 | 3 | ||||
| ❷ | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 
| ❸ | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 
| ❹ | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 
| ❺ | 25 | 26 | 27 | 28 | 29 | 30 | |
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