WEEKNUMBER


Main5systems
2026/12/27(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
2026 week52
[12/21(MON)-12/27(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
2026 week52
[12/21(MON)-12/27(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 week1
[12/26(SAT)-1/1(FRI)

2026/12(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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