BIP 50: Proposed action items, including the hardfork, are completed. BIP 73: Implemented by at least Bitcoin Core and BitPay.
This came up on the mailing list. yyyy-mm-dd (ISO 8601) is the internationally accepted format for numeric dates. This commit changes all BIPs to use that instead of dd-mm-yyyy. It also updates BIP 0001 to prescribe the new format.
https://en.bitcoin.it/w/index.php?title=BIP_0073&oldid=40584