WEEKNUMBER


Main5systems
2027/1/2(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
2027 week1
[12/28(MON)-1/3(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
←2026 week53
[12/28(MON)-1/3(SUN)
★C-TYPE USA(january1)
SUNDAY START
2027 week1
[12/27(SUN)-1/2(SAT)]
D-TYPE USA(january4)
SUNDAY START
←2026 week52
[12/27(SUN)-1/2(SAT)]
★E-TYPE SAT(january1)
SATURDAY START
2027 week2
[1/2(SAT)-1/8(FRI)

2027/1(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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