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-rw-r--r--src/core/main.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/src/core/main.c b/src/core/main.c
index 29f97364a4..f67c003941 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -1358,7 +1358,14 @@ int main(int argc, char *argv[]) {
if (clock_is_localtime() > 0) {
int min;
- /* The first-time call to settimeofday() does a time warp in the kernel */
+ /*
+ * The very first call of settimeofday() also does a time warp in the kernel.
+ *
+ * In the rtc-in-local time mode, we set the kernel's timezone, and rely on
+ * external tools to take care of maintaining the RTC and do all adjustments.
+ * This matches the behavior of Windows, which leaves the RTC alone if the
+ * registry tells that the RTC runs in UTC.
+ */
r = clock_set_timezone(&min);
if (r < 0)
log_error("Failed to apply local time delta, ignoring: %s", strerror(-r));
@@ -1366,19 +1373,19 @@ int main(int argc, char *argv[]) {
log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
} else if (!in_initrd()) {
/*
- * Do dummy first-time call to seal the kernel's time warp magic
+ * Do a dummy very first call to seal the kernel's time warp magic.
*
* Do not call this this from inside the initrd. The initrd might not
* carry /etc/adjtime with LOCAL, but the real system could be set up
* that way. In such case, we need to delay the time-warp or the sealing
* until we reach the real system.
+ *
+ * Do no set the kernel's timezone. The concept of local time cannot
+ * be supported reliably, the time will jump or be incorrect at every daylight
+ * saving time change. All kernel local time concepts will be treated
+ * as UTC that way.
*/
- clock_reset_timezone();
-
- /* Tell the kernel our timezone */
- r = clock_set_timezone(NULL);
- if (r < 0)
- log_error("Failed to set the kernel's timezone, ignoring: %s", strerror(-r));
+ clock_reset_timewarp();
}
}