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Object Pascal

function StartOfADay(const AYear, ADayOfYear: Word): TDateTime;
function StartOfADay(const AYear, AMonth, ADay: Word): TDateTime;


extern DELPHI_PACKAGE System::TDateTime __fastcall StartOfADay(const System::Word AYear, const System::Word ADayOfYear)/* overload */;


Type Visibility Source Unit Parent
function public
System.DateUtils System.DateUtils


Returns a TDateTime that represents 12:00:00:00 A.M. on a specified day.

StartOfADay returns the first expressible moment (12:00:000 A.M.) of a specified day.

The AYear parameter specifies the year of the desired day.

The ADayOfYear parameter specifies the desired day as a day of the year, where 1 is January 1, 2 is January 2, 32 is February 1, and so on.

The AMonth and ADay parameters specify the desired day as a month of the year and day of the month. AMonth can range from 1 through 12. ADay can range from 1 through 28, 29, 30, or 31, depending on the values of AYear and AMonth.

If the parameters do not specify a valid date, StartOfADay raises throws an EConvertError exception.

See Also

Code Examples