test-parse-date: defines explicit start/end dates for DST Prior to this patch, DST times where tested by specifying a custom TZ environment variable that didn't defined DST transition times. Due to a bug in glibc, the test fail on 32bits platforms that use timezone files generated by zic from tzcode >= 2014c (glibc >= 2.20). See https://sourceware.org/bugzilla/show_bug.cgi?id=19738 By defining explicit transition times for DST in the TZ environment variable, the test is now independant to how the system guess those transition times.