tree 07ae5a402c134e8e3a8d3f734760009209fe71d0
parent cc7c300d1af22641b012268a959ac42f15341ed8
author Rich Felker <dalias@aerifal.cx> 1517855764 -0500
committer Rich Felker <dalias@aerifal.cx> 1517855901 -0500

fix strftime field widths with %F format and zero year

the code to strip initial sign and leading zeros inadvertently
stripped all the zeros and the subsequent '-' separating the month.
instead, only strip sign characters from the very first position, and
only strip zeros when they are followed by another digit.

based on testing by Dennis Wölfing.