WEEKNUMBER


Main5systems
2021/12/31(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
2022 week1
[12/27(MON)-1/2(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
2021 week52
[12/27(MON)-1/2(SUN)
★C-TYPE USA(january1)
SUNDAY START
2022 week1
[12/26(SUN)-1/1(SAT)]
D-TYPE USA(january4)
SUNDAY START
2021 week52
[12/26(SUN)-1/1(SAT)]
★E-TYPE SAT(january1)
SATURDAY START
2021 week53
[12/25(SAT)-12/31(FRI)

2021/12(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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