From 13755c09036aefe9209360bf0a94c3e2a83e12b8 Mon Sep 17 00:00:00 2001 From: lat9nq <22451773+lat9nq@users.noreply.github.com> Date: Wed, 12 Jul 2023 02:34:02 -0400 Subject: [PATCH] time_zone: Account for leap years Protects against invalid hour offsets during transitions to years following leap years. --- src/common/time_zone.cpp | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/src/common/time_zone.cpp b/src/common/time_zone.cpp index a25f8b040..1ee63bf80 100644 --- a/src/common/time_zone.cpp +++ b/src/common/time_zone.cpp @@ -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; }