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[core] Fix timezone offset calculation (#10426)

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This commit is contained in:
Eyal
2025-09-01 22:45:25 -06:00
committed by GitHub
parent ed48282d09
commit f286bc57f3
1 changed files with 6 additions and 20 deletions
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26
esphome/core/time.cpp
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@@ -203,27 +203,13 @@ void ESPTime::recalc_timestamp_local() {
}
int32_t ESPTime::timezone_offset() {
int32_t offset = 0;
time_t now = ::time(nullptr);
auto local = ESPTime::from_epoch_local(now);
auto utc = ESPTime::from_epoch_utc(now);
bool negative = utc.hour > local.hour && local.day_of_year <= utc.day_of_year;
if (utc.minute > local.minute) {
local.minute += 60;
local.hour -= 1;
}
offset += (local.minute - utc.minute) * 60;
if (negative) {
offset -= (utc.hour - local.hour) * 3600;
} else {
if (utc.hour > local.hour) {
local.hour += 24;
}
offset += (local.hour - utc.hour) * 3600;
}
return offset;
struct tm local_tm = *::localtime(&now);
local_tm.tm_isdst = 0; // Cause mktime to ignore daylight saving time because we want to include it in the offset.
time_t local_time = mktime(&local_tm);
struct tm utc_tm = *::gmtime(&now);
time_t utc_time = mktime(&utc_tm);
return static_cast<int32_t>(local_time - utc_time);
}
bool ESPTime::operator<(const ESPTime &other) const { return this->timestamp < other.timestamp; }