https://learn.microsoft.com/en-us/dotnet/api/system.globalization.japanesecalendar.addmonths?view=netframework-4.8.1&viewFallbackFrom=net-10.0
JapaneseCalendar.AddMonths(DateTime, Int32) Method (System.Globalization) | Microsoft Learn
Returns a DateTime that is the specified number of months away from the specified DateTime.
datetimemethodsystemglobalizationmicrosoft
https://docs.oracle.com/en/database/oracle/oracle-database/19/odpnt/TimeStampAddMonths.html
AddMonths
https://www.cognitoforms.com/templates/332/addmonthsnumber
Free AddMonths(Number) Template - Cognito Forms
Adds the specified number of months to the Date value.
freenumbertemplatecognitoforms