don't repeat the word 'date' in the phrase 'unknown date' since that phrase appears in the 'Date' column, so it's obvious from just the word 'unknown' that it's the date that is unknown

locale/en-US/utils.properties

@@ -1,32 +1,32 @@
-unknownDate = unknown date
+unknownDate   = unknown
 
-monday    = Monday
-tuesday   = Tuesday
-wednesday = Wednesday
-thursday  = Thursday
-friday    = Friday
-saturday  = Saturday
-sunday    = Sunday
+monday        = Monday
+tuesday       = Tuesday
+wednesday     = Wednesday
+thursday      = Thursday
+friday        = Friday
+saturday      = Saturday
+sunday        = Sunday
 
 # LOCALIZATION NOTE (yesterdayTime): %S is the time of day in hours and minutes
 # as returned by nsIScriptableDateFormat::FormatTime (f.e. "12:34").
 yesterdayTime = Yesterday %S
 
-future    = The Future
-evening   = Evening
-afternoon = Afternoon
-morning   = Morning
+future        = The Future
+evening       = Evening
+afternoon     = Afternoon
+morning       = Morning
 
 # LOCALIZATION NOTE (weeHours): Wee hours is a euphemism for the early hours
 # of the morning.  Snowls uses this expression to describe the hours between
 # midnight and six in the morning (i.e. 00:00 - 06:00).
-weeHours  = Wee Hours
+weeHours      = Wee Hours
 
-today     = Today
-yesterday = Yesterday
-older     = Older
+today         = Today
+yesterday     = Yesterday
+older         = Older
 
-weekOne   = Week One
-weekTwo   = Week Two
-weekThree = Week Three
-weekFour  = Week Four
+weekOne       = Week One
+weekTwo       = Week Two
+weekThree     = Week Three
+weekFour      = Week Four