Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Handle rewriting timestamps from the specific RSS feed's format to a
more unified Instant string format.

If a DateTimeParseException is thrown while attempting to work with the
date format, use that opportunity to attempt to parse that original date
with the given date format pattern, then convert it into a string using
'Instant#toString'.

If the conversion fails, simply return an empty Optional and let the
rest of the code handle it from there since the new value will be
overwritten in any case.

Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>