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TOMONTH (MonthIndex)

  • is any number from 1 to 12.


  • This function shows the name of the month for the given Index number.
  • In , is any number from 1 to 12.
  • A year is divided into 12 months in the modern-day Gregorian calendar.
  • The traditional concept arose with the cycle of moon phases.
  • Such months are synodic months and last approximately 29.53 days.
  • Each month has either 28, 30, or 31 days during a common year, which has 365 days.
  • During leap years, which occur nearly every 4 years, we add an extra intercalary day, Leap Day, on 29 February, making leap years 366 days long.
  • This is to keep our current calendar aligned with the solar year and astronomical seasons marked by equinoxes and solstices.
  • So this function will show as January when Month Index is 1.
  • When The parameter value is 2,then will show February and so on.
  • This function will return the result as error when the Month Index value is other than 1 to 12.


  1. TOMONTH(1) = January
  2. TOMONTH(9) = September
  3. TOMONTH(12) = December
  4. TOMONTH(13) = Null

See Also