WEEKNUMBER


Main5systems
2025/12/29(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
2026 week1
[12/29(MON)-1/4(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
→2026 week1
[12/29(MON)-1/4(SUN)
★C-TYPE USA(january1)
SUNDAY START
2026 week1
[12/28(SUN)-1/3(SAT)]
D-TYPE USA(january4)
SUNDAY START
2025 week53
[12/28(SUN)-1/3(SAT)]
★E-TYPE SAT(january1)
SATURDAY START
2026 week1
[12/27(SAT)-1/2(FRI)

2025/12(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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