Using WordPress ‘get_month_link()’ PHP function
Retrieves the permalink for the month archives with year.
Date
Using WordPress ‘get_gmt_from_date()’ PHP function
Given a date in the timezone of the site, returns that date in UTC.
Using WordPress ‘get_post_field()’ PHP function
Retrieves data from a post field based on Post ID.
Using WordPress ‘iso8601_timezone_to_offset()’ PHP function
Given an ISO 8601 timezone, returns its UTC offset in seconds.