Version 1.0.1:

* Fix a bug where days were calculated based on time in UTC, not the local timezone
* Make clearer what the default date format does

Author: jgillula

src/chrome/content/enhancedDateFormatter.js

@@ -12,8 +12,14 @@ EnhancedDateFormatter.getDateFormatForDate = function (date) {
     // January 1, 1970, UTC, and there are 86400000 in a day, so
     // to get the number of days, just divide by 86400000 and
     // floor the result
-    var todayDay = Math.floor((new Date()).valueOf()/86400000);
-    var dateDay = Math.floor(date.valueOf()/86400000);
+
+    // Additionally, in order to correct for the timezone (so we're
+    // not getting day numbers in UTC), we need to subtract off the
+    // timezone offset (which is given in minutes, so we need to
+    // multiply by 60000 to get milliseconds)
+    var todayDate = new Date();
+    var todayDay = Math.floor((todayDate.valueOf()-todayDate.getTimezoneOffset()*60000)/86400000);
+    var dateDay = Math.floor((date.valueOf()-date.getTimezoneOffset()*60000)/86400000);
 
     if (EnhancedDateFormatter.preferences.getValue('useCustomFormatForLastWeek', false) &&
         dateDay > (todayDay-6)) {

src/chrome/content/preferences.js

@@ -11,7 +11,7 @@ function setDisabledOrEnabled(ids, value) {
 }
 
 EnhancedDateFormatter.adjustDisabledStates = function() {
-    setDisabledOrEnabled(["label_defaultDateFormat", "textbox_defaultDateFormat",
+    setDisabledOrEnabled(["label_defaultDateFormat", "description_defaultDateFormat", "textbox_defaultDateFormat",
                           "checkbox_useCustomFormatForToday",
                           "checkbox_useCustomFormatForYesterday",
                           "checkbox_useCustomFormatForLastWeek"],

src/chrome/content/preferences.xul

@@ -67,8 +67,15 @@
 
         <description style="font-weight: bold">Note: To view your changes, you may need to restart Thunderbird.</description>
 
-        <hbox>
-          <label id="label_defaultDateFormat" control="textbox_defaultDateFormat" value="Default date format:" />
+        <hbox align="center">
+          <vbox>
+            <label id="label_defaultDateFormat" control="textbox_defaultDateFormat">
+              Default date format:
+            </label>
+            <description id="description_defaultDateFormat">
+              (For any date not covered by one of the conditions below)
+            </description>
+          </vbox>
           <textbox id="textbox_defaultDateFormat" preference="extensions.enhancedDateFormatter.defaultDateFormat"/>
         </hbox>
 

src/install.rdf

@@ -5,7 +5,7 @@
 
   <Description about="urn:mozilla:install-manifest">
     <em:id>enhanceddateformatter@jeremy.gillula</em:id>
-    <em:version>1.0.0</em:version>
+    <em:version>1.0.1</em:version>
     <em:type>2</em:type>
     <em:targetApplication>
       <Description>