Your Weather-Display settings are uploading dates in d/m/y format.
Change Settings.php from $SITE['WDdateMDY'] = true; // for WD date format of month/day/year. =false for day/month/year
to $SITE['WDdateMDY'] = false; // for WD date format of month/day/year. =false for day/month/year
and the dates will be parsed correctly.
However, for a USA site, instead of the above, you should just change Weather-Display to use month/day/year format for all Web dates,
then both clientraw.txt and testtags.php will both have m/d/y formatted dates (they currently have d/m/y formatted dates).