# Date-Time References

Overall Index -- Gregorian Index -- Posix Time Index

The following are a number of references and sources of information about the date-time domain.

- Date References
- Time References
- Other C/C++ Libraries
- JAVA Date-Time Libraries
- Scriping Language Libraries
- Related Commerical and Fanciful Pages
- Resolution, Precision, and Accuracy

### Date Calendar References

- ISO 8601 date time standard -- Summary by Markus Kuhn
- Calendrical Calculations book by Reingold & Dershowitz
- Calendar FAQ by Claus Tøndering [html][pdf]
- Calendar zone http://www.calendarzone.com/
- XML schema for date time
- Will Linden's Calendar Links
- XMAS calendar melt

### Time

- Martin Folwer on time patterns
  - Recurring Events for Calendars
  - Patterns for things that Change with time

- US National Institute of Standards and Technology Time Exhibits
- Network Time Protocol at NTP.org
- US Navy Systems of Time
- International Atomic Time
- Date-Time type PostgreSQL User Guide

### Other C/C++ Libraries

- ctime C Standard library reference at cplusplus.com
- XTime C extension proposal
- Another C library extension proposal by David Tribble
- libTAI is a C based time library
- Time Zone Database C library for managing timezones/places
- International Components for Unicode by IBM (open source)
  - Calendar Class
  - Date Time Services
  - Time Zone Class
  - Date-Time Formatting
- Julian Library in C by Mark Showalter -- NASA

### JAVA Date & Time Library Quick Reference

- Calendar class
- Gregorian calendar
- Date class
- sql.time class
- Date format symbols
- Date format
- Simple Date Format
- Simple Time Zone

### Scripting Language Libraries

- A python date library MX Date Time
- Perl date-time
  - Date-Time packages at CPAN
  - Date::Calc at CPAN
  - Date::Convert calendar conversions at CPAN
- A PHP library Vlib Date Library

### Related Commercial and Fanciful Pages

- Leapsecond.com time page
- World Time Server / TZ database
- 10000 year clock at Long Now Foundation
- Timezones for PCs

### Resolution, Precision, and Accuracy

- Definitions with pictures from Agilent Technologies
- Another set of pictures from Team Labs
- Definitions from Southampton Institute
- Definitions from Newport Corporation in the context of instrumentation