aspDateSelector
asp Date Selector allows you to add popup date range selection to your date fields. Works in multiple date formats. Adding a date selector has never been easier.
http://www.aspdateselector.com

Date Calculator
Perform date math, calculate date differences, and organize data and events.
http://www.datecalculator.com/

Attribute Magic
AttributeMagic Free! - utility to modify file dates and attributes (Freeware)
http://www.elwinsoft.com/atm.html

DateUtilX
Exposes methods and properties to manipulate date and calendar date types, including support for business related date functionality. By Mckisic Software, Inc.
http://www.mckisicsoftware.com/DateUtilX/dateutilx.htm

ISO 8601 Date and Time - Converting and Implementing
ProbabilityOf.com ISO 8601 page - Converting and Implementing
http://www.probabilityof.com/ISO8601.shtml

Date and Time on the Internet - Timestamps
Document: draft-ietf-impp-datetime-05 - An updated proposal to use a limited subset of ISO-compliant date formats for date stamps on the Internet - by Chris Newman.
http://community.roxen.com/developers/idocs/drafts/draft-ietf-impp-datetime-05.txt

12Ghosts ShowTime
Displays the date or day of week in the System Tray area of the Taskbar set the date and time format, and the fonts and color to display. A floating window can also be kept on screen to display the time and date.
http://12ghosts.com/ghosts/showtime.htm

Lifespan Age Calculator
Accepts a start and finish date then computes the difference in years, months and days. Also accepts an end date and an age then computes the starting date.
http://www.anzwers.org/free/lifespan/

Zaks.Directory
Enumerates a selected file system directory as a collection of objects, file properties returned include size, creation date, last write date, last access date, archive, system, readonly and hidden flags. By Simon Fell.
http://www.zaks.demon.co.uk/code/cpts/dir/

ViaScope
Family of product offering Network Monitoring Solution in your centralized or distributed environment. RMONI/II based Network Monitoring, Web Access Monitoring and blocking, WAN Bandwith monitoring and allocation.
http://www.viascope.com