-Checked in patches for bug 260169:

generalize formatDateTime and formatInterval relative to given date, not just today
-Removed redundant AllDay entry from calendar.properties

calendar/locales/en-US/chrome/calendar/calendar.properties

@@ -115,7 +115,6 @@ TooManyAlarmsMessage=You have %1$S total alarms. We've shown you the last 6. Cli
 1001=Warning UID not found! Assigning new one.
 
 # List of events or todos (unifinder)
-AllDay=All Day
 eventUntitled=Untitled
 
 # Tooltips of events or todos

calendar/locales/en-US/chrome/calendar/dateFormat.properties

@@ -91,6 +91,8 @@ day.7.short=S
 am-string=AM
 pm-string=PM
 
+AllDay=All Day
+
 # Added to support localization of messages within eventDialog.js
 #   Day ordinals imply order within a list.
 ordinal.suffix.1=st