Fix for #2150 - SNAP TO NEXT does not work properly. It looks like the javascript DATE object changes the time you give it depending on your offset to GMT. I added a function to calculate the number of milliseconds in times directly instead of relying on the Date object.

campcaster/src/modules/htmlUI/var/templates/popup/SCHEDULER.addItem.tpl

@@ -47,25 +47,57 @@ function SCHEDULE_snap2Prev()
 {literal}
 }
 
+/**
+ * Take a string as input in the form "HH:MM:SS" and return
+ * the number of milliseconds this represents from the time
+ * "00:00:00".
+ *
+ * @param string p_timeString
+ * @return int
+ */
+function SCHEDULE_timeToMilliseconds(p_timeString)
+{
+{/literal}
+    if (p_timeString.length != 8) return 0;
+
+    var arr = p_timeString.split(":");
+    if (arr.length != 3) return 0;
+
+    // hours
+    milliseconds = arr[0]*60*60*1000;
+    // minutes
+    milliseconds += arr[1]*60*1000;
+    // seconds
+    milliseconds += arr[2]*1000;
+    return milliseconds;
+{literal}
+}
+
 function SCHEDULE_snap2Next()
 {
 {/literal}
-    // Get the absolute "next item" time, meaning how many milliseconds from
-    // the beginning of the day that the next item starts.
-    var nextItemTime = new Date("january 01, 1970 {$SCHEDULER->scheduleNext.hour}:{$SCHEDULER->scheduleNext.minute}:{$SCHEDULER->scheduleNext.second}");
+    // Get the number of milliseconds from the beginning of the day
+    // that the next item in the schedule starts.
+    var nextItemTime = SCHEDULE_timeToMilliseconds("{$SCHEDULER->scheduleNext.hour}:{$SCHEDULER->scheduleNext.minute}:{$SCHEDULER->scheduleNext.second}");
 
-    // Get the absolute duration of the playlist in Date format (milliseconds)
-    var duration = new Date("january 01, 1970 " + SCHEDULE_selectedDuration());
+    // Get the duration of the item to be scheduled in milliseconds.
+    var duration = SCHEDULE_timeToMilliseconds(SCHEDULE_selectedDuration());
 
-    // Get the date of the "next item".
+    // Get the date of the "next item" (time is set to midnight).
     var beginDate = new Date({$SCHEDULER->scheduleNext.year},
                              {$SCHEDULER->scheduleNext.month},
                              {$SCHEDULER->scheduleNext.day});
+    //debugBeginDate = ""+beginDate;
 
-    // Calculate the final time by starting with the "next item" date (midnight),
-    // add in milliseconds to the starting time of the "next item",
+    // Calculate the final time by starting with the "next item" date at midnight,
+    // add in milliseconds midnight to "next item" start time,
     // subtract the duration of the selected playlist.
-    beginDate.setTime(beginDate.getTime() + nextItemTime.getTime() - duration.getTime());
+    beginDate.setTime(beginDate.getTime() + nextItemTime - duration);
+    //alert("next item time: "+nextItemTime+"\n"
+    //      +"duration: "+(duration)+"\n"
+    //      +"debug begin date: "+debugBeginDate+"\n"
+    //      +"begin date: "+beginDate+"\n");
+
     document.forms["schedule"].elements["time[H]"].value = beginDate.getHours();
     document.forms["schedule"].elements["time[i]"].value = beginDate.getMinutes();
     document.forms["schedule"].elements["time[s]"].value = beginDate.getSeconds();