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Hi,


I’m trying to make a formula that gives me the last day of the current month. So, while we’re in March I want it to return 31 or 2018-03-31 and when we get to April return 30 or 2018-04-30.


It seems pretty simple in JS (https://stackoverflow.com/questions/1184334/get-number-days-in-a-specified-month-using-javascript) - but don’t know how to do it on Airtable.



Any ideas?


Thanks a lot!



Best


Sune

Try this formula:



DATETIME_DIFF(DATETIME_PARSE("1-"&CONCATENATE(MONTH(TODAY())+1)&"-"&YEAR(TODAY()),"D-M-YYYY"), DATETIME_PARSE("1-"&MONTH(TODAY())&"-"&YEAR(TODAY()),"D-M-YYYY"),"d")


You can explore it here: https://airtable.com/shrXEpPCnjcgCm76n





  • You could pass a Date instead of using TODAY()



  • I had to use CONCATENATE() to convert the Next Month to a string


Try this formula:



DATETIME_DIFF(DATETIME_PARSE("1-"&CONCATENATE(MONTH(TODAY())+1)&"-"&YEAR(TODAY()),"D-M-YYYY"), DATETIME_PARSE("1-"&MONTH(TODAY())&"-"&YEAR(TODAY()),"D-M-YYYY"),"d")


You can explore it here: https://airtable.com/shrXEpPCnjcgCm76n





  • You could pass a Date instead of using TODAY()



  • I had to use CONCATENATE() to convert the Next Month to a string



Works perfectly - thanks a lot Elias!

Couldn’t you just have a 12 row table and look it up?

Much after the topic, but for those who come here looking for an answer this is simple and would work too:


DAY(DATEADD(DATEADD(DATETIME_FORMAT(TODAY(),‘YYYY-MM’),1,‘month’),-1,‘days’))

Try this formula:



DATETIME_DIFF(DATETIME_PARSE("1-"&CONCATENATE(MONTH(TODAY())+1)&"-"&YEAR(TODAY()),"D-M-YYYY"), DATETIME_PARSE("1-"&MONTH(TODAY())&"-"&YEAR(TODAY()),"D-M-YYYY"),"d")


You can explore it here: https://airtable.com/shrXEpPCnjcgCm76n





  • You could pass a Date instead of using TODAY()



  • I had to use CONCATENATE() to convert the Next Month to a string



Hi @Elias_Gomez_Sainz, thanks for your formula! Does the formula work with dates in the month of December? I can get it to work with all other months except when I pass it a Dec date. Curious if others are seeing it work with Dec dates. Thanks

Workshop_Team’s formula works well, but you have to convert the curly quotes to straight quotes:



DAY(


  DATEADD(


    DATEADD(


      DATETIME_FORMAT(YEAR({date}) & "-" & MONTH({date}) ,"YYYY-MM"),


      1,


      "months"


    ),


    -1,


    "days"


  )


)


Or you could try this formula:



SWITCH(MONTH({date}), 


  1, 31,


  2,  IF(MOD(YEAR({date}), 400) = 0,


        29,


        IF(MOD(YEAR({date}), 100) = 0,


          28,


          IF(MOD(YEAR({date}), 4) = 0,


            29,


            28


          )


        )


      ),


  3, 31,


  4, 30,


  5, 31,


  6, 30,


  7, 31,


  8, 31,


  9, 30,


  10, 31,


  11, 30,


  12, 31


)

Workshop_Team’s formula works well, but you have to convert the curly quotes to straight quotes:



DAY(


  DATEADD(


    DATEADD(


      DATETIME_FORMAT(YEAR({date}) & "-" & MONTH({date}) ,"YYYY-MM"),


      1,


      "months"


    ),


    -1,


    "days"


  )


)


Or you could try this formula:



SWITCH(MONTH({date}), 


  1, 31,


  2,  IF(MOD(YEAR({date}), 400) = 0,


        29,


        IF(MOD(YEAR({date}), 100) = 0,


          28,


          IF(MOD(YEAR({date}), 4) = 0,


            29,


            28


          )


        )


      ),


  3, 31,


  4, 30,


  5, 31,


  6, 30,


  7, 31,


  8, 31,


  9, 30,


  10, 31,


  11, 30,


  12, 31


)

Nice work @kuovonne. Thanks!

Workshop_Team’s formula works well, but you have to convert the curly quotes to straight quotes:



DAY(


  DATEADD(


    DATEADD(


      DATETIME_FORMAT(YEAR({date}) & "-" & MONTH({date}) ,"YYYY-MM"),


      1,


      "months"


    ),


    -1,


    "days"


  )


)


Or you could try this formula:



SWITCH(MONTH({date}), 


  1, 31,


  2,  IF(MOD(YEAR({date}), 400) = 0,


        29,


        IF(MOD(YEAR({date}), 100) = 0,


          28,


          IF(MOD(YEAR({date}), 4) = 0,


            29,


            28


          )


        )


      ),


  3, 31,


  4, 30,


  5, 31,


  6, 30,


  7, 31,


  8, 31,


  9, 30,


  10, 31,


  11, 30,


  12, 31


)

Thank you @kuovonne - the switch function version works in December, each leap year, and is clear and easy to read and understand. 🙂 😀

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