fix gettimeofday (was off by one day)

2021-09-19 17:56:20 +02:00 · 2021-09-19 17:56:20 +02:00 · c124cf98d9
parent beb4c2c518
commit c124cf98d9
1 changed files with 6 additions and 1 deletions
--- a/libretro/syscalls.c
+++ b/libretro/syscalls.c
@ -276,7 +276,12 @@ int _gettimeofday_r(struct _reent *reent, struct timeval *tp, void *__tz)

    if(tp)
    {
-        tp->tv_sec = secs - 86400 * (365 * 66 + 66/4);
+        const int epochDifferenceInYears = 1970 - 1904;
+        const int epochDifferenceInDays =
+            365 * epochDifferenceInYears
+            + (epochDifferenceInYears + 3)/ 4;  // round up for leap years
+
+        tp->tv_sec = secs - 86400 * epochDifferenceInDays;
        tp->tv_usec = (ticks - savedTicks) * 20000000 / 2003;
    }