Fix more TZ bugs; warn if TZ name looks suspicious.

src/dorem.c

@@ -20,9 +20,6 @@
 #include <stdlib.h>
 #include <time.h>
 
-#include <fcntl.h>
-#include <sys/stat.h>
-
 #include "types.h"
 #include "globals.h"
 #include "err.h"
@@ -38,24 +35,6 @@ static int ComputeTrigDuration(TimeTrig const *t);
 
 static int CalledEnterTimezone = 0;
 
-static int HaveZoneinfoDir = -1;
-
-#define ZONE_DIR "/usr/share/zoneinfo"
-static int have_zoneinfo_dir(void)
-{
-    struct stat sb;
-    if (HaveZoneinfoDir < 0) {
-        if (stat(ZONE_DIR, &sb) < 0) {
-            HaveZoneinfoDir = 0;
-        } else if ((sb.st_mode & S_IFMT) != S_IFDIR) {
-            HaveZoneinfoDir = 0;
-        } else {
-            HaveZoneinfoDir = 1;
-        }
-    }
-    return HaveZoneinfoDir;
-}
-
 int AdjustTriggerForTimeZone(Trigger *trig, int dse, TimeTrig *tim)
 {
     int y, m, d, hour, minute;
@@ -164,6 +143,7 @@ void EnterTimezone(char const *tz)
     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--;
@@ -1287,24 +1267,8 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim)
     }
 
     /* Check that TZ looks plausible */
-    if (trig->tz && (*trig->tz != '!') && have_zoneinfo_dir()) {
-        if (* (trig->tz) != '!') {
-            DynamicBuffer zfile;
-            struct stat sb;
-            int r;
-            DBufInit(&zfile);
-            DBufPuts(&zfile, ZONE_DIR);
-            DBufPuts(&zfile, "/");
-            DBufPuts(&zfile, trig->tz);
-            r = stat(DBufValue(&zfile), &sb);
-            DBufFree(&zfile);
-            if (r < 0) {
-                if (warning_level("06.01.05")) {
-                    Wprint(tr("No time zone file found for TZ `%s'... is it valid?"),
-                           trig->tz);
-                }
-            }
-        }
+    if (trig->tz && (*trig->tz != '!')) {
+        warn_if_timezone_bad(trig->tz);
     }
 
     /* Remove leading ! from TZ spec */

src/protos.h

@@ -304,3 +304,5 @@ int AdjustTriggerForTimeZone(Trigger *trig, int dse, TimeTrig *tim);
 void EnterTimezone(char const *tz);
 void ExitTimezone(char const *tz);
 int warning_level(char const *which);
+void warn_if_timezone_bad(char const *tz);
+

src/trigger.c

@@ -621,11 +621,15 @@ int ComputeTriggerNoAdjustDuration(int today, Trigger *trig, TimeTrig const *tim
         if (trig->tz) {
             TimeTrig copy = *tim;
             int new_result;
+            int force_retry = 0;
             ExitTimezone(trig->tz);
             new_result = AdjustTriggerForTimeZone(trig, result, &copy);
+            if (trig->scanfrom == NO_SCANFROM && new_result < DSEToday) {
+                force_retry = 1;
+            }
             EnterTimezone(trig->tz);
-            if (result + duration_days >= today &&
-                new_result + duration_days < today) {
+            if (force_retry ||
+                (result + duration_days >= today &&new_result + duration_days < today)) {
                 /* If we are not making progress, then give up: It's expired */
                 if (nextstart <= save_nextstart) {
                     trig->expired = 1;

src/utils.c

@@ -28,10 +28,31 @@ static char const DontEscapeMe[] =
 #include <ctype.h>
 
 #include <stdlib.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
 #include "types.h"
 #include "globals.h"
 #include "protos.h"
 
+static int HaveZoneinfoDir = -1;
+
+#define ZONE_DIR "/usr/share/zoneinfo"
+static int have_zoneinfo_dir(void)
+{
+    struct stat sb;
+    if (HaveZoneinfoDir < 0) {
+        if (stat(ZONE_DIR, &sb) < 0) {
+            HaveZoneinfoDir = 0;
+        } else if ((sb.st_mode & S_IFMT) != S_IFDIR) {
+            HaveZoneinfoDir = 0;
+        } else {
+            HaveZoneinfoDir = 1;
+        }
+    }
+    return HaveZoneinfoDir;
+}
+
 /* Call this instead of system() so if called ignores return code,
    we don't get a compiler warning.  Also redirect stdin to /dev/null */
 int system1(char const *cmd)
@@ -378,3 +399,34 @@ warning_level(char const *which)
     if (!WarningLevel) return 1;
     return strcmp(WarningLevel, which) >= 0;
 }
+
+void
+warn_if_timezone_bad(char const *tz)
+{
+    DynamicBuffer zfile;
+    struct stat sb;
+    int r;
+
+    if (!tz) {
+        return;
+    }
+    if (*tz == '!') {
+        return;
+    }
+    if (!have_zoneinfo_dir()) {
+        return;
+    }
+    DBufInit(&zfile);
+    DBufPuts(&zfile, ZONE_DIR);
+    DBufPuts(&zfile, "/");
+    DBufPuts(&zfile, tz);
+    r = stat(DBufValue(&zfile), &sb);
+    DBufFree(&zfile);
+    if (r < 0) {
+        if (warning_level("06.01.05")) {
+            Wprint(tr("No time zone file found for TZ `%s'... is it valid?"),
+                   tz);
+        }
+    }
+}
+

tests/test-timezone-support

@@ -190,6 +190,11 @@ TZ=America/Toronto $REMIND -s - 2025-10-01 <<'EOF' >> $OUT 2>&1
 REM Wednesday AT 14:00 TZ Australia/Sydney MSG 2PM Sydney
 EOF
 
+# Every day...
+TZ=America/Toronto $REMIND -s - 2025-10-01 <<'EOF' >> $OUT 2>&1
+REM AT 04:44 TZ America/Los_Angeles MSG 04:44 in Los Angeles
+EOF
+
 cmp -s $OUT $CMP
 if [ "$?" = "0" ] ; then
     echo "Remind:   Time zone tests ${GRN}PASSED${NRM}"

tests/tz.cmp

@@ -91,3 +91,34 @@ trig("Mon at 00:00 TZ Australia/Sydney", "Tue at 00:00 TZ America/Toronto", "Wed
 2025/10/14 * * * 1380 11:00pm 2PM Sydney
 2025/10/21 * * * 1380 11:00pm 2PM Sydney
 2025/10/28 * * * 1380 11:00pm 2PM Sydney
+2025/10/01 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/02 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/03 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/04 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/05 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/06 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/07 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/08 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/09 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/10 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/11 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/12 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/13 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/14 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/15 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/16 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/17 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/18 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/19 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/20 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/21 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/22 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/23 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/24 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/25 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/26 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/27 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/28 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/29 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/30 * * * 464 7:44am 04:44 in Los Angeles
+2025/10/31 * * * 464 7:44am 04:44 in Los Angeles