asDateString
The date-time from a tstr with tag Tagged.FULL_DATE_STRING.
Throws
if the data item isn't a tag with tag Tagged.FULL_DATE_STRING containing a tstr with valid date format.
The date-time from a tstr with tag Tagged.FULL_DATE_STRING.
if the data item isn't a tag with tag Tagged.FULL_DATE_STRING containing a tstr with valid date format.