WEEKNUMBER


Main5systems
1971/4/20(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
1971 week17
[4/19(MON)-4/25(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
1971 week16
[4/19(MON)-4/25(SUN)
★C-TYPE USA(january1)
SUNDAY START
1971 week17
[4/18(SUN)-4/24(SAT)]
D-TYPE USA(january4)
SUNDAY START
1971 week16
[4/18(SUN)-4/24(SAT)]
★E-TYPE SAT(january1)
SATURDAY START
1971 week17
[4/17(SAT)-4/23(FRI)

1971/4(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

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