检查当前日期是否是该月的最后一天

Question

I couldn't solve the formula for checking if the cell with a date is the last DAY of the MONTH . I'm playing around with the EOMONTH and WEEKDAY which is not working for me.

For example, the DAY I'm looking for is TUESDAY , and the cell A1 has a date, I wanted to check if the value of A1 is the last TUESDAY of the Month .

With the Weekday function I can tell if the date is Tuesday or Not :

=IF(WEEKDAY(A1)={5}, "Tuesday", "NO")

With EOMONTH I can get the last date of the month:

=EOMONTH(A1,0)

Do these two can be combined to achieve what I want? Or if not, what should be the formula?

Answer 1

Yes, you can combined those two functions to find the last X or Day of the Month.

Assuming your cell is A1 , pick the one that will suit to your needs.

LAST DAY OF THE MONTH

• LAST SUN: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),11),7)
• LAST MON: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),12),7)
• LAST TUE: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),13),7)
• LAST WED: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),14),7)
• LAST THU: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),15),7)
• LAST FRI: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),16),7)
• LAST SAT: =EOMONTH(A1,0)-MOD(WEEKDAY(EOMONTH(A1,0),17),7)

Just incase you want the reverse for the first day of the month.

FIRST DAY OF THE MONTH

• FIRST SUN: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,11)),7)
• FIRST MON: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,12)),7)
• FIRST TUE: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,13)),7)
• FIRST WED: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,14)),7)
• FIRST THU: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,15)),7)
• FIRST FRI: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,16)),7)
• FIRST SAT: =EOMONTH(A1,-1)+1+MOD((7-WEEKDAY(EOMONTH(A1,-1)+1,17)),7)

Refer to this link for a brief explanation about the formula.