Test function. Checks if is sting is of an ISO 8601-1:2019 date with time format
with the UTC time zone (Z or +00:00). It must include the date and time from hours
to seconds. It can optionally use fractional seconds with up to three digits.
Correct dates are e.g. "2022-06-10T09:51:20.275+00:00", "2022-06-10T09:51:20.275Z",
and "2022-06-10T09:51:20Z" (but not "2022-06-10T09" which is per specification
a valid ISO 8601-1:2019 date and time format).
Test function. Checks if is sting is of an ISO 8601-1:2019 date with time format with the UTC time zone (Z or +00:00). It must include the date and time from hours to seconds. It can optionally use fractional seconds with up to three digits. Correct dates are e.g. "2022-06-10T09:51:20.275+00:00", "2022-06-10T09:51:20.275Z", and "2022-06-10T09:51:20Z" (but not "2022-06-10T09" which is per specification a valid ISO 8601-1:2019 date and time format).