diff --git a/tasmota/xdrv_10_rules.ino b/tasmota/xdrv_10_rules.ino
index 2b26107a7..53774d999 100644
--- a/tasmota/xdrv_10_rules.ino
+++ b/tasmota/xdrv_10_rules.ino
@@ -477,7 +477,11 @@ bool RulesRuleMatch(uint8_t rule_set, String &event, String &rule, bool stop_all
       if ((index > 0) && (index <= MAX_TIMERS)) {
         snprintf_P(stemp, sizeof(stemp), PSTR("%%TIMER%d%%"), index);
         if (rule_param.startsWith(stemp)) {
-          rule_param = String(Settings->timer[index -1].time);
+          int32_t timer = Settings->timer[index -1].time;
+          if (Settings->timer[index -1].mode && (timer >= 12*60)) {
+            timer = -(timer - (12*60));
+          }
+          rule_param = String(timer);
         }
       }
     }
@@ -796,7 +800,11 @@ bool RuleSetProcess(uint8_t rule_set, String &event_saved)
 #if defined(USE_TIMERS)
       for (uint32_t i = 0; i < MAX_TIMERS; i++) {
         snprintf_P(stemp, sizeof(stemp), PSTR("%%TIMER%d%%"), i +1);
-        RulesVarReplace(commands, stemp, String(Settings->timer[i].time));
+        int32_t timer = Settings->timer[i].time;
+        if (Settings->timer[i].mode && (timer >= 12*60)) {
+          timer = -(timer - 12*60);
+        }
+        RulesVarReplace(commands, stemp, String(timer));
       }
 #if defined(USE_SUNRISE)
       RulesVarReplace(commands, F("%SUNRISE%"), String(SunMinutes(0)));