Function replaceTZString

replaceTZString(dateTimeString: string, tzOffset: string): string
Replaces the timezone offset on a ISO-format (not necessarily in UTC) date string with the given offset. Returns a new date time string.
Parameters
- dateTimeString: string
  The date time string (ISO format, not necessarily in UTC) to use.
- tzOffset: string
  An ISO timezone offset string to give to the resulting date time string.
Returns string