Delphi Basics : RTL by starting letter : D

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Type	Name	Summary

Compiler Directive	$D	Determines whether application debug information is built
Compiler Directive	$DebugInfo	Determines whether application debug information is built
Compiler Directive	$Define	Defines a compiler directive symbol - as used by IfDef
Compiler Directive	$DefinitionInfo	Determines whether application symbol information is built
Function	Date	Gives the current date
Variable	DateSeparator	The character used to separate display date fields
Function	DateTimeToFileDate	Convert a TDateTime value to a File date/time format
Function	DateTimeToStr	Converts TDateTime date and time values to a string
Procedure	DateTimeToString	Rich formatting of a TDateTime variable into a string
Function	DateToStr	Converts a TDateTime date value to a string
Function	DayOfTheMonth	Gives day of month index for a TDateTime value (ISO 8601)
Function	DayOfTheWeek	Gives day of week index for a TDateTime value (ISO 8601)
Function	DayOfTheYear	Gives the day of the year for a TDateTime value (ISO 8601)
Function	DayOfWeek	Gives day of week index for a TDateTime value
Function	DaysBetween	Gives the whole number of days between 2 dates
Function	DaysInAMonth	Gives the number of days in a month
Function	DaysInAYear	Gives the number of days in a year
Function	DaySpan	Gives the fractional number of days between 2 dates
Procedure	Dec	Decrement an ordinal variable
Variable	DecimalSeparator	The character used to display the decimal point
Procedure	DecodeDate	Extracts the year, month, day values from a TDateTime var.
Procedure	DecodeDateTime	Breaks a TDateTime variable into its date/time parts
Procedure	DecodeTime	Break a TDateTime value into individual time values
Directive	Default	Defines default processing for a property
Function	DegToRad	Convert a degrees value to radians
Procedure	Delete	Delete a section of characters from a string
Function	DeleteFile	Delete a file specified by its file name
Keyword	Destructor	Defines the method used to destroy an object
Function	DirectoryExists	Returns true if the given directory exists
Function	DiskFree	Gives the number of free bytes on a specified drive
Function	DiskSize	Gives the size in bytes of a specified drive
Procedure	Dispose	Dispose of storage used by a pointer type variable
Keyword	Div	Performs integer division, discarding the remainder
Keyword	Do	Defines the start of some controlled action
Type	Double	A floating point type supporting about 15 digits of precision
Keyword	DownTo	Prefixes an decremental for loop target value
Function	DupeString	Creates a string containing copies of a substring
Directive	Dynamic	Allows a class method to be overriden in derived classes

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	Calculations Conversions from Conversions to Values Displaying

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