Jul 4, 2018

ISO 8601 can be used by anyone who wants to use a standardized way of presenting dates and times.

ISO 8601 can be used by anyone who wants to use a standardized way of presenting dates and times. It helps cut out the uncertainty and confusion when communicating internationally.

The full standard covers ways to write:


  • Date
  • Time of day
  • Coordinated universal time (UTC)
  • Local time with offset to UTC
  • Date and time
  • Time intervals
  • Recurring time intervals

expressed according to ISO 8601:

Date: 2018-07-04
Combined date and time in UTC: 2018-07-04T19:47:34+00:00
2018-07-04T19:47:34Z
20180704T194734Z
Week: 2018-W27
Date with week number: 2018-W27-3
Date without year: --07-04 
Ordinal date: 2018-185