Merge pull request libgit2#5938 from NattyNarwhal/time-type-mismatch

Fix wrong time_t used in function

Author: ethomson

src/date.c

@@ -204,7 +204,7 @@ static int is_date(int year, int month, int day, struct tm *now_tm, time_t now,
 	if (month > 0 && month < 13 && day > 0 && day < 32) {
 		struct tm check = *tm;
 		struct tm *r = (now_tm ? &check : tm);
-		time_t specified;
+		git_time_t specified;
 
 		r->tm_mon = month - 1;
 		r->tm_mday = day;