Editing ISO 8601 (section)

==Combined date and time representations==
{| class="infobox" style="text-align:center; width:23em"
|-
| &lt;date&gt;T&lt;time&gt;
|}

A single point in time can be represented by concatenating a complete date expression, the letter ''"T"'' as a delimiter, and a valid time expression. For example, {{nowrap|"2007-04-05T14:30"}}. In ISO&nbsp;8601:2004 it was permitted to omit the ''"T"'' character by mutual agreement as in {{nowrap|"200704051430"}},<ref>{{Cite book |title=ISO 8601:2004(E): Data elements and interchange formats — Information interchange — Representation of dates and times |date=2004-12-01 |publisher=[[International Organization for Standardization|ISO]] |quote=4.3.2 NOTE: By mutual agreement of the partners in information interchange, the character [T] may be omitted in applications where there is no risk of confusing a date and time of day representation with others defined in this International Standard.}}</ref> but this provision was removed in ISO&nbsp;8601-1:2019.
Separating date and time parts with other characters such as space is not allowed in ISO&nbsp;8601, but allowed in its profile RFC 3339.<ref>{{cite IETF
|author=G. Klyne
|author2=C. Newman
|date=July 2002
|title=Date and Time on the Internet: Timestamps
|rfc=3339|section=5.6
|sectionname=Internet Date/Time Format
|quote=NOTE: ISO 8601 defines date and time separated by "T". Applications using this syntax may choose, for the sake of readability, to specify a full-date and full-time separated by (say) a space character.}}</ref>

If a time zone designator is required, it follows the combined date and time. For example, {{nowrap|"2007-04-05T14:30Z"}} or {{nowrap|"2007-04-05T12:30−02:00"}}.

Either basic or extended formats may be used, but both date and time must use the same format. The date expression may be calendar, week, or ordinal, and must use a complete representation. The time may be represented using a specified reduced precision format.