| 2012/2/7(YY/MM/DD) WEEKNUMBER OF YEAR | |
| A-TYPE ISO(janyary1) MONDAY START | 2012 week7 [2/6(MON)-2/12(SUN) | 
| ★B-TYPE ISO(janyary4) ISO8601 STANDARD MONDAY START | 2012 week6 [2/6(MON)-2/12(SUN) | 
| ★C-TYPE USA(january1) SUNDAY START | 2012 week6 [2/5(SUN)-2/11(SAT)] | 
| D-TYPE USA(january4) SUNDAY START | 2012 week6 [2/5(SUN)-2/11(SAT)] | 
| ★E-TYPE SAT(january1) SATURDAY START | 2012 week6 [2/4(SAT)-2/10(FRI) | 
| 2012/2(USA) | |||||||
| SUN | MON | TUE | WED | THU | FRI | SAT | |
| ❶ | 1 | 2 | 3 | 4 | |||
| ❷ | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 
| ❸ | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 
| ❹ | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 
| ❺ | 26 | 27 | 28 | 29 | |||
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