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• Date() ➜ dCurDate
  returns the current system date as reported by the system clock.

• Day( <dDate> ) ➜ nDay
  returns the numeric day of the month of <dDate>. When <dDate> is an empty date, the function returns zero.

• Days( <nSecs> ) ➜ nDay
  converts <nSecs> seconds to the equivalent number of days

• DaysInMonth( <nMonth>, <lLeapYear> ) ➜ nDaysInMonth
  returns the number of days in month. (xhb library, been put here for reminder).

• DaysToMonth( <nMonth>, <lLeapYear> ) ➜ nDaysToMonth
  return total number of days from first of Jan to beginning of <nMonth>. (xhb library, been put here for reminder).

• All db***() database related functions, that is, all functions from dbAppend() to dbUseArea(), as well as, hb_db***() extensions, have been moved in a separate page.
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• DefPath() ➜ cDefaultPath
  returns the current default path, if it has been set, or empty string otherwise.
  a synonym to __DefPath().

• Deleted() ➜ lDeleted
  returns .T. or .F. if the current record is marked for deletion or not.

• DeleteFile(<cFileName>) ➜ nErrorCode
  returns zero on success or a numeric error code on failure.

• Descend(<exp>) ➜ ValueInverted
  returns an inverted expression of the same data type as the <exp>, except for dates which return a numeric value. A Descend() of CHR(0) always returns CHR(0).

• DevOut(<exp>, [<cColorString>]) ➜ NIL

• DevOutPict(<exp>, <cPicture>, [<cColorString>]) ➜ NIL

• DevPos(<nRow>, <nCol>) ➜ NIL

• DirChange(<cDir>) ➜ nResult
  Change the current DOS directory. <cDir> is the name of the directory to change to, including the drive. Returns 0 if successful or -1 if there is an argument error or the DOS error code otherwise.

• Directory(<cDirSpec> [, <cAttributes>]) ➜ aDirectory
  returns an array of subarrays with filenames matching to <cDirSpec> filter.
  Each subarray has the structure: {cF_NAME, nF_SIZE, dF_DATE, cF_TIME, cF_ATTR}.
  Wildcards are allowed in <cDirSpec>, e.g: "*.txt" or "*.tx?".
  If <cDirSpec> is omitted, the default value is "*.*" (all files).
  See also: hb_Directory()

• DirRemove(<cDirName>) ➜ nSuccess
  removes a specified directory. Returns 0 if successful or -1 if there is an argument error. Otherwise, the DOS error code. Note that you must have sufficient rights to delete a directory. A directory must be empty in order to be deleted.

• DiskChange(<cNewDrive>) ➜ lSuccess
  returns true .T. if an attempt to change current drive to <cNewDrive> was successful, otherwise returns false .F.. Valid values for <cNewDrive>, which specifies the letter of the target disk drive to change to, are in range A-Z or a-z.

• DiskName() ➜ cDrive
  Returns the letter of the current DOS drive, without a trailing colon.

• DiskSpace([<nDrive>]) ➜ nBytes
  returns the number of bytes of empty space on the given disk drive.
  Optional parammeter <nDrive> is the number of the disk drive to investigate, where 1 is the drive A:, 2 is B:, 3 is C:, etc. If <nDrive> is omitted or specified as 0 (zero) then by default is used the current drive.
  See also: hb_DiskSpace() and hb_vfDirSpace() for more options/features.

• DispBegin() ➜ NIL

• DispBox(<nTop>, <nLeft>, <nBottom>, <nRight>, [<cnBoxString>], [<cColorString>]) ➜ NIL

• DispCount() ➜ nDispCount

• DispEnd() ➜ NIL

• DispOut(<exp>, [<cColorString>]) ➜ NIL

• DispOutAt(<nRow>, <nCol>, <expression> [, <cColor>]) -➜ NIL
  writes a single value to the screen at speficic position, but is not affected by SET ALTERNATE.

• DMY([<dDate>][, <lMode>]) ➜ cDateString
  Returns the date as a string in DD Month YY format.

• DOSError([<nNewOsCode>]) ➜ nOsCode

• DoW(<dDate>) ➜ nDay
  returns the day of the week as a number between 1 and 7 or 0 if <dDate> is empty. The first day of the week is 1 (Sunday) and the last day is 7 (Saturday).

• DoY([<dDate>]) ➜ nDayOfYear
  returns a calendar day number that specifies which day of the year <dDate> represents. If dDate is NULL, the system date is used. An empty or invalid date returns 0.

• DToC(<dDate>) ➜ cDate
  converts a date value to string. returned value is formatted in the current date format (default: mm/dd/yy). A null date returns a string of spaces equal in length to the current date format.
  NOTE: The result is affected by the current SET DATE/SET DATE FORMAT and SET EPOCH settings, which may lead to unexpected/incorrect results. For conversions between DATE to CHARACTER and vice-versa, use DtoS()/StoD() that are independent of those settings.

• DToS( <dDate> ) ➜ cDate
  returns a character string in YYYYMMDD format. If <dDate> is empty returns an eight spaces long string.

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