![iso 8601 iso 8601](https://previews.123rf.com/images/adrianbud/adrianbud1402/adrianbud140200002/26025260-calendrier-2015-janvier-iso-8601-avec-le-numéro-de-la-semaine.jpg)
UTC is replaced with Z that is the zero UTC offset.
Iso 8601 iso#
![iso 8601 iso 8601](https://i.ytimg.com/vi/UgY4O8m4qHI/maxresdefault.jpg)
Iso 8601 full#
This discards valuable information, as the server, or recipient, can always convert a full ISO date to Zulu time or whichever timezone it requires, while still getting the timezone information of the sender. toISOString() also drops timezone information. Almost every to-ISO method on the web drops the timezone information by applying a convert to "Z"ulu time (UTC) before outputting the string.