@LetsRoc @tychotithonus @robertatcara IIRC an Australian bank had issues in 2010 when all their ATMs started rejecting cards. The Y2K fix they had implemented was to treat the last two digits of the year as hexadecimal, so come 1/1/2010 they thought it was 2016 and therefore all the cards were out of date!

Edit: it was PoS machines in Australia; the ATM issue was in Germany computerworld.com/article/2759