Date Functions
= D4 + E4 / 24/60
= (E9-D9) * 60 * 24 (re-set to the normal mode)
= D14 + E14
= D18-E18
=DATE(YEAR(B5),MONTH(B5)+C5,DAY(B5))
=DATE(YEAR(B13),MONTH(B13)+1,0)
=DATE(YEAR(B13),MONTH(B13)+1,1)-1
=DAY(DATE(YEAR(B13),MONTH(B13)+1,0))
=DATEDIF(B5,C5,"y")
=DATEDIF(B6,C6+1,"y")
=DATEDIF(B13,C13,"y")&"年"&DATEDIF(B13,C13,"ym")&"月"&DATEDIF(B13,C13,"md")&"天"
="第"&WEEKNUM(B13,2)&"周第"&WEEKDAY(B13,2)&"天"
=TEXT(B3,"aaaa")
= TEXT (B10, "0000-00-00") * 1 (then reconverted to date)