date to iso 8601 code example

Example: ISO 8601

YYYY-MM-DD'T'hh:mm:ss'Z'

Z is the ofset from the UTC timezone 
it can be replaced with "(+/-)hh:mm"
if ofset is not specified, character 'Z' is in place instead

2021-01-01T01:01:01+01:00
2021-02-02T02:02:42.069-02:00
2021-03-03T03:03:03.3Z
20210404T040404Z