RAD Studio VCL Reference
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Returns a TDateTime that represents 12:00:00:00 AM on a specified day.
StartOfADay returns the first expressible moment (12:00:000 AM) 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 to 12. ADay can range from 1 to 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.
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