Delphi Month Day automatically add one minus one function, monthly plus one, month minus one

Source: Internet
Author: User

Months minus Month:

function Getlastmonth (adate:tdatetime): Tdatetime;
Var
Dwyear, Dwmonth, Dwday:word;
Begin
Result: = adate;
Try
Decodedate (Adate, Dwyear, Dwmonth, Dwday);
Result: = Encodedate (Dwyear, Dwmonth, 1)-1;
Except
End
End

Months increase Month:

function Tform1.getlastmonth (adate:tdatetime): Tdatetime;
Var
Dwyear, Dwmonth, Dwday:word;
Begin
Result: = adate;
Try
Decodedate (Adate, Dwyear, Dwmonth, Dwday);
If Dwmonth=12 Then
Begin
Result: = Encodedate (dwyear+1, 1, 1);
End
Else
Result: = Encodedate (Dwyear, dwmonth+1, 1);
Except
End
End

Call:

Edit1.text:=datetimetostr (Getlastmonth (Date ()));

Delphi Month Day automatically add one minus one function, monthly plus one, month minus one

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