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