Batch files - Examples (D*)

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Name	Description	OS ⁽¹⁾	Last modified (DD/MM/YYYY)	Remarks
DateAdd	Add/subtract a specified number of days to/from a specified date	NT	12/02/2007	Based on Fliegel-Van Flandern Julian date conversion algorithms from the Astronomical Almanac, provided by Doctor Fenton on the Math Forum and converted to batch code by Ron Bakowski
DateDiff	Calculate the difference in days between two dates	NT	04/06/2007	Based on Fliegel-Van Flandern Julian date conversion algorithms from the Astronomical Almanac, provided by Doctor Fenton on the Math Forum and converted to batch code by Ron Bakowski
DateFmt	Show the current date in the specified format	NT	07/08/2008	Inspired by Simon Sheppard's GetDate.bat
DatePart	Return the specified numerical part of the current date or time	NT	15/11/2008	Batch "wrapper" for VBScript's DatePart( ) function
DateTime	Store week day, current date and current time in environment variables	All		Take a look at SortDate and SortTime for an NT version with language independent sorting, or at DateErrT for a version that uses ErrTime by Phil Money to remain virtually OS independent
DateTime.cmd	Return the current date as errorlevel in YYYYMMDD format	XP	27/04/2009	Written by Justin. Tested only in Windows XP. Requires modifications to work on non-English systems.
DDLU.bat	Don't Display Last Username: clears the last user name from the login dialog box permanently.	NT	20/12/2001	Use CLLUN.bat instead to remove the last logon user name just this once. See the Related Stuff section for a note on "Don't Display Last Username" in Vista and Windows 7.
DeadProf.bat	Delete inactive corrupted profiles for current user	NT	15/09/2000
Dec2Hex.bat	Convert a decimal number to 8 digit hexadecimal	NT	08/12/2007	This batch file uses a "poorly documented" feature of the PING command to convert a decimal number to hexadecimal. Requires FINDSTR (not native in NT 4, but part of the Resource Kit). Also available in KiXtart, Perl, Rexx and VBScript.
DecToHex.bat	Convert a decimal number to "7.5" digit hexadecimal	NT	08/12/2007	This batch file uses CMD.EXE's internal commands only. Also available in KiXtart, Perl, Rexx and VBScript.
DefOpen.bat	Create a default file association to Notepad and add "Open with Notepad", "Print with Notepad" and "Command Prompt Here" options to popup menus	95 98 NT 2000 XP	21/11/2007	Based on a tip by Regedit.com. More details on my REGEDIT page.
DefPRN.bat	Display default printer name	NT	07/11/1999	Also available as OS/2 Rexx, Windows Rexx, JScript, KiXtart, Perl and VBScript scripts
DefPRN2K.bat	Display default printer name	W2K	13/02/2002
DelFlash.bat	Delete "Local Stored Objects", also known as "Flash Cookies", from the current user's profile	NT	15/09/2007	Tested on Windows XP SP2 only. Use entirely at your own risk! Also available in VBScript.
DelOutlX.bat	Uninstall Outlook Express (BETA!)	W2K	20/12/2003	Tested on 1 Windows 2000 computer only. Use entirely at your own risk!
DelProf.bat	Delete specified profile (BETA!)	NT	17/12/2003	Still in beta! That is why the most destructive command of the batch file is echoed only.
Desktop.bat	Uses SHORTCUT.EXE to save all desktop shortcuts as a batch file that can recreate those shortcuts again (Desktop backup)	NT+RK	05/08/2001
Disabled.bat	Lists all disabled user accounts	NT	21/09/2000
DiskFree	Check amount of free disk space, the hard way	All		Use FreeSpace.vbs if you need a more reliable tool
DiskSpc	Display harddisk summary for any WMI enabled computer or for a list of computers	XP	02/10/2006	Uses WMIC
DiskUse.bat	List the disk usage for every subdirectory	NT	20/12/2003	Returns negative numbers if total file sizes exceed 2GB. Also available as Rexx script
DiskUse.bat	List the disk usage for every subdirectory	W2K	21/12/2003	Fixed negative numbers bug for Windows 2000/XP
DispEDID.bat	Display your monitor's EDID asset information	XP	20/02/2007	Also available in VBScript
DllMenu.bat	Add "Register" and "Unregister" to Explorer's context menu for DLLs & OCXs	W2K	18/04/2007
DriveRdy.bat	Check if (removable) drive is ready	DOS6+ OS2	18/07/1999	Also available as OS/2 Rexx script
Drives.bat	List local drive letters and types	W2K	17/12/2003
DrivUsed.bat	List used and available drive letters	XP	30/12/2007

0..9

Notes:	(1)	Operating System version these batch files were meant for
		All	No version specific commands are used, though it is (obviously) not tested with every DOS version available
		95	Windows 95 (and probably Windows 98 as well)
		98	Windows 98
		DOS3	MS-DOS 3 and 4
		DOS6+	MS-DOS 6 and later
		Kix	Windows (most functions also in plain DOS) with KiXtart
		NT4	Windows NT 4 (Windows NT 4 Terminal Server Edition too)
		NT	Windows NT (Windows 2000 and Windows NT 4 Terminal Server Edition too)
		NT+RK	Windows NT with Resource Kit (Windows NT 4 Terminal Server Edition with Resource Kit too)
		W2K	Windows 2000, and probably XP and Server 2003 as well
		W2K+RK	Windows 2000 with (Server) Resource Kit, and (probably) XP and Server 2003 as well
		W2K3	Windows Server 2003
		XP	Windows XP
		OS2	OS/2 Warp
		TS	Windows NT 4 Terminal Server Edition, or Windows 2000 Server or Windows Server 2003 with Terminal Services

In Vista and Windows 7, to disable showing the last used user ID at login, or to force the use of Ctrl+Alt+Del at login, use the Local Security Policy editor.
Open it from the Control Panel, or by using the command SECPOL.MSC and navigate to "Security Settings", "Local Policies", "Security Options" and find the "Interactive logon" settings in the right pane.

Now enable "Interactive logon: Do not display last user name" to disable displaying the last user name, and disable "Interactive logon: Do not require CTRL+ALT+DEL" to require the use of Ctrl+Alt+Del.