Build a TDateTime value from year, month and day values SysUtils unit
 function EncodeDate(const Year, Month, Day Word):TDateTime;
The EncodeDate function generates a TDateTime return value from the passed Year, Month and Day values.
The permitted parameter values are :
Year  = 2000..9999
Month  = 1..12
Day  = 1..31 (depending on month/year)

If you exceed these values, an EConvertError is raised.
The time value for the TDateTime is always set to 00:00:00.00
Related commands
DecodeDateExtracts the year, month, day values from a TDateTime var.
DecodeDateTimeBreaks a TDateTime variable into its date/time parts
DecodeTimeBreak a TDateTime value into individual time values
EncodeDateTimeBuild a TDateTime value from day and time values
EncodeTimeBuild a TDateTime value from hour, min, sec and msec values
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Example code : Assign a date to a TDateTime variable
  myDate : TDateTime;

  // Set my date variable using the EncodeDate function
  myDate := EncodeDate(2000, 02, 29);

  LongTimeFormat := 'hh:mm:ss.zzz';  // Ensure that MSecs are shown

  ShowMessage('Date set to '+DateToStr(myDate));
  ShowMessage('Time set to '+TimeToStr(myDate));
Show full unit code
  Date set to 29/02/2000
  Time set to 00:00:00.000
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