CCF_100
/
yuzu-mirror
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

time_zone: Account for leap years 

Protects against invalid hour offsets during transitions to years
following leap years.
master
lat9nq 2023-07-12 02:34:02 +07:00
parent 833306bf5e
commit 13755c0903
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/common/time_zone.cpp
Unescape Escape View File

@ -35,11 +35,13 @@ std::string GetDefaultTimeZone() {
// Results are not comparable to seconds since Epoch
static std::time_t TmSpecToSeconds(const struct std::tm& spec) {
const int year = spec.tm_year - 1; // Years up to now
const int leap_years = year / 4 - year / 100;
std::time_t cumulative = spec.tm_year;
cumulative = cumulative * 365 + spec.tm_yday; // Years to days
cumulative = cumulative * 24 + spec.tm_hour; // Days to hours
cumulative = cumulative * 60 + spec.tm_min; // Hours to minutes
cumulative = cumulative * 60 + spec.tm_sec; // Minutes to seconds
cumulative = cumulative * 365 + leap_years + spec.tm_yday; // Years to days
cumulative = cumulative * 24 + spec.tm_hour; // Days to hours
cumulative = cumulative * 60 + spec.tm_min; // Hours to minutes
cumulative = cumulative * 60 + spec.tm_sec; // Minutes to seconds
return cumulative;
}