WEEKNUMBER


Main5systems
1989/5/17(YY/MM/DD)
WEEKNUMBER OF YEAR
A-TYPE ISO(janyary1)
MONDAY START
1989 week21
[5/15(MON)-5/21(SUN)
★B-TYPE ISO(janyary4)
ISO8601 STANDARD
MONDAY START
1989 week20
[5/15(MON)-5/21(SUN)
★C-TYPE USA(january1)
SUNDAY START
1989 week20
[5/14(SUN)-5/20(SAT)]
D-TYPE USA(january4)
SUNDAY START
1989 week20
[5/14(SUN)-5/20(SAT)]
★E-TYPE SAT(january1)
SATURDAY START
1989 week20
[5/13(SAT)-5/19(FRI)

1989/5(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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