Fix timezone bug reported by Jin Chen.

src/calendar.c

@@ -873,6 +873,8 @@ void ProduceCalendar(void)
             LocalDSEToday -= ((LocalDSEToday+1)%7);
         }
 
+        LocalSysTime = 0;
+        SysTime = 0;
         GenerateCalEntries(-1);
 
         if (!DoSimpleCalendar) {

src/dorem.c

@@ -141,6 +141,8 @@ void EnterTimezone(char const *tz)
     CurDay   = tm.tm_mday;
     CurMon   = tm.tm_mon;
     CurYear  = tm.tm_year + 1900;
+
+    DSEToday = DSE(CurYear, CurMon, CurDay);
     /* Adjust DSEToday back by a day if midnight in our time zone requires it */
     if (SysTime < LocalSysTime) {
         DSEToday--;

tests/test-timezone-support

@@ -164,6 +164,19 @@ EOF
 TZ=America/Toronto $REMIND -s - 2025-09-01@00:00 <<'EOF' >> $OUT 2>&1
 REM 2025-09-24 AT 09:00 TZ America/Denver MSG Dr. Smith
 EOF
+
+echo "" >> $OUT
+# Bug reported by Jin Chen
+TZ=Australia/Sydney $REMIND -s - 2025-10-01 <<'EOF' >> $OUT 2>&1
+REM Wednesday AT 14:00 TZ America/Toronto MSG 2PM Eastern
+EOF
+
+echo "" >> $OUT
+# And the inverse...
+TZ=America/Toronto $REMIND -s - 2025-10-01 <<'EOF' >> $OUT 2>&1
+REM Wednesday AT 14:00 TZ Australia/Sydney MSG 2PM Sydney
+EOF
+
 cmp -s $OUT $CMP
 if [ "$?" = "0" ] ; then
     echo "Remind:   Time zone test PASSED"

tests/tz.cmp

@@ -79,3 +79,15 @@ trig("Mon at 00:00 TZ Australia/Sydney", "Tue at 00:00 TZ America/Toronto", "Wed
 -stdin-(14:21): Trig = Monday, 1 September, 2025 AT 14:42
 2025-09-01
 2025/09/24 * * * 660 11:00am Dr. Smith
+
+2025/10/02 * * * 240 4:00am 2PM Eastern
+2025/10/09 * * * 300 5:00am 2PM Eastern
+2025/10/16 * * * 300 5:00am 2PM Eastern
+2025/10/23 * * * 300 5:00am 2PM Eastern
+2025/10/30 * * * 300 5:00am 2PM Eastern
+
+2025/10/01 * * * 0 12:00am 2PM Sydney
+2025/10/07 * * * 1380 11:00pm 2PM Sydney
+2025/10/14 * * * 1380 11:00pm 2PM Sydney
+2025/10/21 * * * 1380 11:00pm 2PM Sydney
+2025/10/28 * * * 1380 11:00pm 2PM Sydney