}
// ECMA 262 - 15.9.1.9
+ // LocalTime(t) = t + LocalTZA + DaylightSavingTA(t)
+ // ECMA 262 assumes that DaylightSavingTA is computed using UTC time,
+ // but we fetch DST from OS using local time, therefore we need:
+ // LocalTime(t) = t + LocalTZA + DaylightSavingTA(t + LocalTZA).
int64_t ToLocal(int64_t time_ms) {
- return time_ms + LocalOffsetInMs() + DaylightSavingsOffsetInMs(time_ms);
+ time_ms += LocalOffsetInMs();
+ return time_ms + DaylightSavingsOffsetInMs(time_ms);
}
// ECMA 262 - 15.9.1.9
+ // UTC(t) = t - LocalTZA - DaylightSavingTA(t - LocalTZA)
+ // ECMA 262 assumes that DaylightSavingTA is computed using UTC time,
+ // but we fetch DST from OS using local time, therefore we need:
+ // UTC(t) = t - LocalTZA - DaylightSavingTA(t).
int64_t ToUTC(int64_t time_ms) {
- time_ms -= LocalOffsetInMs();
- return time_ms - DaylightSavingsOffsetInMs(time_ms);
+ return time_ms - LocalOffsetInMs() - DaylightSavingsOffsetInMs(time_ms);
}