CSGNetwork.com Free Information

ISO 8601 Time Standard

This calculator requires the use of Javascript enabled and capable browsers. This creates and displays the time in the ISO 8601 International format standard. This standard was originally approved on September 15, 1997 and later accepted in slightly modified and much clearer form on December 21, 2000, so that people would not have a Y2K problem. (By my math, that is almost a year late!) Below, we further define what we feel is the most bizarre (clearer) standard we have ever seen in computers.

In order from left to right,

Year in the form YYYY-MM-DD
Month in the form YYYY-MM-DD
Day in the form YYYY-MM-DD

The ISO states the 10 character format is suggested but there are options, such as the year can be displayed in two character format, the dashes don't have to be used and actually, only the year or month or date can be displayed singularly or with only one of the other two.

T used to indicate "Time will follow", if date and time are stored on the same line and field
Hours in the form hh:mm:ss
Minutes hh:mm:ss
Seconds hh:mm:ss

As is the case with the date, the 8 character format is suggested with the colons being separators. However, virtually everything is optional. A tenths, hundredths and thousandths of seconds field is optional after the seconds. You really don't have to use the colons, or display the hours, minutes or seconds if not needed. If the time is UTC, a capital Z is used after the time, no space between, however spaces are optional.

UTC Offset of Hours

If the time is not UTC, then the number displayed immediately after the time, is the time offset, positive or negative, from UTC time. Spaces should not be used to separate, however spaces are optional.

This all goes to show that even though this is ISO 8601, which more or less replaced RFC 1123, TANS (there ain't no standard)!

This standard, lean as it is, is also the generally accepted guideline for time functions used by amateur radio operators around the world. For more information on the subject and perhaps a clearer understanding of how non-standard standards really are, you might want to look at these sites: http://www.w3.org/TR/NOTE-datetime, http://www.ietf.org/rfc/rfc1123.txt and http://www.cl.cam.ac.uk/~mgk25/iso-time.html. You might also wish to see the early America time standard, Back Porch Close To Time Conversation Non-Standard Standard Calculator.

ISO 8601 Standard



Version 1.7.1


Leave us a question or comment on Facebook
Search or Browse Our Site
Free Information Calculators and Converters

International Copyright Violation
Registered® Trademark™ and Copyrightę 1973 - CSG, Computer Support Group, Inc. and CSGNetwork.Com All Rights Reserved