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calculate the GMT delta for the current timezone and apply it when calculating bios_local_time

This commit is contained in:
Anthony Pesch 2017-10-14 11:27:29 -04:00
parent c5fd569f28
commit 3c8c2cf81c
1 changed files with 13 additions and 4 deletions
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17
src/guest/bios/bios.c
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@ -48,10 +48,19 @@ static uint32_t bios_local_time() {
5 leap days from the current time to match them up. note, mktime / difftime
can't be used here with a tm struct filled out for 1950 as not all libc
implementations support negative timestamps */
time_t curr_time_local = time(NULL);
time_t curr_time_utc = mktime(gmtime(&curr_time_local));
time_t base_time_utc = -(20 * 365 + 5) * (24 * 60 * 60);
return (uint32_t)(curr_time_utc - base_time_utc);
time_t rawtime = time(NULL);
struct tm localinfo = *localtime(&rawtime);
struct tm gmtinfo = *gmtime(&rawtime);
/* gmtime will set tm_isdst to 0. set to -1 to force mktime to check if the
timestamp is in dst or not */
gmtinfo.tm_isdst = -1;
time_t localtime = mktime(&localinfo);
time_t gmttime = mktime(&gmtinfo);
double gmtdelta = difftime(gmttime, localtime);
double gmtoffset = (20 * 365 + 5) * (24 * 60 * 60);
return (uint32_t)(localtime - gmtdelta + gmtoffset);
}
static void bios_override_settings(struct bios *bios) {