DelphiBasics IncDay Function Increments a TDateTime variable by + or - number of days DateUtils unit

function IncDay(const StartDateTime TDateTime {; NumberOfDays Integer = 1}):TDateTime;

Description The IncDay function returns a TDateTime value that is NumberOfDays greater than the passed StartDateTime value.   The year and month values are incremented as appropriate.   The increment value is optional, being 1 by default. Notes There is no DecDay function. Instead, use IncDay with a negative increment. Related commands IncMinute Increments a TDateTime variable by + or - number of minutes IncMonth Increments a TDateTime variable by a number of months IncYear Increments a TDateTime variable by a number of years IncSecond Increments a TDateTime variable by + or - number of seconds IncMillisecond Increments a TDateTime variable by + or - number of milliseconds  Download this web site as a Windows program.

Example code : A simple example of increment and decrement var   myDate : TDateTime; begin   // Set up our date just before the end of the year 2000   myDate := EncodeDate(2000, 12, 30);   ShowMessage('myDate = '+DateToStr(myDate));   // Add 10 days to this date   myDate := IncDay(myDate, 10);   ShowMessage('myDate + 10 days = '+DateToStr(myDate));   // Subtract 12 days from this date   myDate := IncDay(myDate, -12);   ShowMessage('myDate - 12 days = '+DateToStr(myDate)); end; Show full unit code   myDate = 30/12/2000   myDate + 10 days = 09/01/2001   myDate - 12 days = 29/12/2000

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