WEEKNUMBER


Main5systems
2021/1/21(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
2021 week4
[1/18(MON)-1/24(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
2021 week3
[1/18(MON)-1/24(SUN)
★C-TYPE USA(january1)
SUNDAY START
2021 week4
[1/17(SUN)-1/23(SAT)]
D-TYPE USA(january4)
SUNDAY START
2021 week3
[1/17(SUN)-1/23(SAT)]
★E-TYPE SAT(january1)
SATURDAY START
2021 week4
[1/16(SAT)-1/22(FRI)

2021/1(USA)
SUN MON TUE WED THU FRI SAT
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31

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