Date formula



I currently have 2 columns on my sheet, one where I enter date processed and date expired which has a formula to calculate 1 year expiration from date processed. I have been asked that no matter what date I process, it needs to expire the last date of that month. So for example,

  • date processed = 9/5/23
  • date expired should be 9/30/23

How would I write this formula AND how would this formula know the actual last day of the month, especially leap year?

Any assistance is appreciated as I do not want to enter this in manually each time.



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