git checkout @{14.days.ago}

warning: Log for '' only goes back to Wed, 23 May 2018 08:02:05 -0400.
HEAD is now at 77a05ed... Update hs-ms100plus.xml

git checkout <commit id>

git log --date=iso | grep -C3 2017-05-

git log --date=iso | grep -C3 2017-05-23