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DELPHI RTL Reference

Date function
Returns the current system date.

DateOf function
Returns only the Date portion of the TDateTime value, by setting Time part to 0.

DateToStr function
Converts a TDateTime value to a string (date part only).

DateTimeToFileDate function
Converts a TDateTime value to a system timestamp value.

DateTimeToStr function
Converts a TDateTime value to a string (date and time).

DateOfWeek function
Returns the day of the week for a given date.

DateOfTheWeek function
Returns the day of the week for a given TDateTimeValue.

DayOfTheMonth function
Returns the day of the month from a given TDateTime value (from 1 to 31)

DayOfTheYear function
Returns the the ordinal position of a TDateTime value's day within its year.

DaySpan function
Gives the number of days (including fractional days) between two specified dates.

DaysBetween function
Gives the number of whole days between two specified dates.

Dec procedure
Decrements an ordinal value by N.

DecodeDate procedure
Separates Year, Month, and Day values from a TDateTime value.

DecodeTime procedure
Separates Hour, Minute, Second, and MilliSecond values from a TDateTime value.

DegToGrad function
Convert angles expressed in degrees to the value in grads.

Delete procedure
Removes a substring from a string.

DeleteFile function
Deletes a specified file.

DivMod procedure
Returns the integer and the remainder of an integer division, in one operation.

DirectoryExists function
Returns True if a specified directory exists.

DiskFree function
Returns the amount of free space in bytes on a specified drive.

DiskSize function
Returns the size in bytes of a specified drive.

DupeString function
Returns a string repeated a specified number of times.

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