chore(term): use time range formatter

src/Handler/Term.hs

@@ -77,20 +77,18 @@ getTermShowR = do
                       -> cell $ formatTime SelFormatDate termEnd >>= toWidget
                   , sortable Nothing (i18nCell MsgTermHolidays) $ \(Entity _ Term{..},_, _)
                       -> cell $ do
-                           let termHolidays' = groupHolidays termHolidays
-                           [whamlet|
-                             $newline never
-                             <ul .list--inline .list--comma-separated>
-                               $forall holiday <- termHolidays'
-                                 $case holiday
-                                   $of Left singleHoliday
-                                     <li>^{formatTimeW SelFormatDate singleHoliday}
-                                   $of Right (startD, endD)
-                                     <li>
-                                       ^{formatTimeW SelFormatDate startD}
-                                       –
-                                       ^{formatTimeW SelFormatDate endD}
-                           |]
+                          let termHolidays' = groupHolidays termHolidays
+                          [whamlet|
+                            $newline never
+                            <ul .list--inline .list--comma-separated>
+                              $forall holiday <- termHolidays'
+                                <li>
+                                  $case holiday
+                                    $of Left singleHoliday
+                                      ^{formatTimeW SelFormatDate singleHoliday}
+                                    $of Right (startD, endD)
+                                      ^{formatTimeRangeW SelFormatDate startD (Just endD)}                                       
+                          |]
                   ]
                 dbtSorting = Map.fromList
                   [ ( "start"

src/Handler/Utils/DateTime.hs

@@ -333,21 +333,29 @@ formatTimeRange' :: ( HasLocalTime t, HasLocalTime t'
                  -> t -- ^ Start
                  -> Maybe t' -- ^ End
                  -> m Text
-formatTimeRange' cont proj startT endT = do
-  startT' <- cont proj startT
+formatTimeRange' cont proj startT Nothing     = cont proj startT
+formatTimeRange' cont proj startT (Just endT) = do  
   let
+    locDayStart = localDay $ toLocalTime startT
+    locDayEnd   = localDay $ toLocalTime endT
+    (yearStart, monthStart, dayStart) = toGregorian locDayStart
+    (yearEnd  , monthEnd  , dayEnd  ) = toGregorian locDayEnd
     endProj = (/\ proj) $ if
-      | Just endT' <- endT
-      , ((==) `on` localDay) (toLocalTime startT) (toLocalTime endT')
-      -> SelFormatTime
+      | locDayStart == locDayEnd
+        -> SelFormatTime      
       | otherwise
-      -> SelFormatDateTime
-  endT' <- for endT $ cont endProj
-
-  return $ case endT' of
-    Nothing     -> startT'
-    Just endT'' -> [st|#{startT'} – #{endT''}|]
-
+        -> SelFormatDateTime  
+  startT' <- cont    proj startT
+  endT'   <- cont endProj   endT
+  return $ if   
+    | SelFormatDate == endProj
+    ,  yearStart ==  yearEnd
+    , monthStart == monthEnd
+      -> if dayStart == dayEnd
+          then startT'
+          else [st|#{dayStart} - #{endT'}|] -- does not work all date/time format strings!
+    | otherwise 
+      ->       [st|#{startT'} - #{endT'}|]
 
 formatTimeRange :: ( HasLocalTime t, HasLocalTime t'
                    , MonadHandler m