I like YYYY-MM-DD for two reasons: 1) Sorting the string representations sorts in time order. 2) It eliminates ambiguity almost completely, because extremely

I like YYYY-MM-DD for two reasons: 1) Sorting the string representations sorts in time order. 2) It eliminates ambiguity almost completely, because extremely few places use YYYY-DD-MM. The ambiguity of most ##/##/## dates is irritating.