When possible, dates should be expressed in ISO 8601 and RFC 3339 compatible
Calendar format, that is to say "YYYY-MM-DD", or otherwise a Combined Date
and Time representation (<date>T<time>
, so "YYYY-MM-DDThh:mm").
Separators for the date (hyphen) and time (colon) components are required
to conform to both ISO 8601 "extended" format and RFC 3339 required format.
In the case of Date and Time representation, a timezone can be added as per RFC 3339 and the newer revisions of the ISO 8601 standard (which allow for negative offsets):
Z
for UTC (e.g. "YYYY-MM-DDThh:mmZ"), or
For more details see examples at link:https://en.wikipedia.org/wiki/ISO_8601 and the publicly available RFC at link:http://tools.ietf.org/html/rfc3339
Other representations from those specifications are not necessarily supported.