feat(units): refactoring #5404

public/app/core/utils/kbn.js

@@ -581,37 +581,10 @@ function($, _, moment) {
     }
     }
   };
   };
 
 
-  // Date and time
-  kbn.toDateTime = function(size, timeScale) {
-    var datetime;
-    if (timeScale === 's') {
-      datetime = moment.unix(size);
-    } else {
-      datetime = moment(size);
-    }
-    return datetime;
-  };
-
   kbn.toDuration = function(size, timeScale) {
   kbn.toDuration = function(size, timeScale) {
     return moment.duration(size, timeScale);
     return moment.duration(size, timeScale);
   };
   };
 
 
-  kbn.valueFormats.dtms = function(size) {
-    return kbn.toDateTime(size, 'ms').format('YYYY-MM-DD hh:mm:ss');
-  };
-
-  kbn.valueFormats.dts = function(size) {
-    return kbn.toDateTime(size, 's').format('YYYY-MM-DD hh:mm:ss');
-  };
-
-  kbn.valueFormats.dtfromnowms = function(size) {
-    return kbn.toDateTime(size, 'ms').fromNow(true);
-  };
-
-  kbn.valueFormats.dtfromnows = function(size) {
-    return kbn.toDateTime(size, 's').fromNow(true);
-  };
-
   kbn.valueFormats.dtdurationms = function(size) {
   kbn.valueFormats.dtdurationms = function(size) {
     return kbn.toDuration(size, 'ms').humanize();
     return kbn.toDuration(size, 'ms').humanize();
   };
   };
@@ -656,17 +629,8 @@ function($, _, moment) {
           {text: 'minutes (m)',       value: 'm'    },
           {text: 'minutes (m)',       value: 'm'    },
           {text: 'hours (h)',         value: 'h'    },
           {text: 'hours (h)',         value: 'h'    },
           {text: 'days (d)',          value: 'd'    },
           {text: 'days (d)',          value: 'd'    },
-        ]
-      },
-      {
-        text: 'date and time',
-        submenu: [
-          {text: 'date and time (ms)', value: 'dtms'},
-          {text: 'date and time (s)',  value: 'dts' },
-          {text: 'from now (ms)',  value: 'dtfromnowms' },
-          {text: 'from now (s)',  value: 'dtfromnows' },
-          {text: 'duration (ms)',  value: 'dtdurationms' },
-          {text: 'duration (s)',  value: 'dtdurations' }
+          {text: 'duration (ms)',     value: 'dtdurationms' },
+          {text: 'duration (s)',      value: 'dtdurations' }
         ]
         ]
       },
       },
       {
       {