.formatUtc: Format date as ISO8601 UTC
Description
Helper that returns an ISO8601 string for the provided date string
Most date formats are supported, as explained in: https://github.com/eddelbuettel/anytime
A value of "now" returns the current UTC date & time
Depends on the local system clock
Usage
.formatUtc(self, dateString = "now")
Arguments
dateString
A string that describes a date. Can also be "now"
Value
(character) Date string