Panel: Different time periods, panels can override dashboard relative time and/or add a time shift, #171, only works for graph panel for now, need feedback for how to do it for singlestat panel

CHANGELOG.md

@@ -3,6 +3,7 @@
 **New features**
 - [Issue #1331](https://github.com/grafana/grafana/issues/1331). Graph & Singlestat: New axis/unit format selector and more units (kbytes, Joule, Watt, eV), and new design for graph axis & grid tab and single stat options tab views
 - [Issue #1241](https://github.com/grafana/grafana/issues/1242). Timepicker: New option in timepicker (under dashboard settings), to change ``now`` to be for example ``now-1m``, usefull when you want to ignore last minute because it contains incomplete data
+- [Issue #171](https://github.com/grafana/grafana/issues/171).   Panel: Different time periods, panels can override dashboard relative time and/or add a time shift
 
 **Enhancements**
 - [Issue #1297](https://github.com/grafana/grafana/issues/1297). Graphite: Added cumulative and minimumBelow graphite functions

src/app/panels/graph/module.js

@@ -124,18 +124,19 @@ function (angular, app, $, _, kbn, moment, TimeSeries, PanelMeta) {
       // check panel time overrrides
       if ($scope.panel.timeFrom) {
         if (_.isString($scope.rangeUnparsed.from)) {
-          $scope.panelMeta.timeInfo = "Last " + $scope.panel.timeFrom;
+          $scope.panelMeta.timeInfo = "last " + $scope.panel.timeFrom;
           $scope.rangeUnparsed.from = 'now-' + $scope.panel.timeFrom;
           $scope.range.from = kbn.parseDate($scope.rangeUnparsed.from);
         }
       }
-      // if ($scope.panel.timeShift) {
-      //   // from: now-1h
-      //   // to: now
-      //   // timeshift: 1d
-      //   // from: now-1d-1h
-      //   // to: now-1d
-      // }
+
+      if ($scope.panel.timeShift) {
+        var timeShift = '-' + $scope.panel.timeShift;
+        $scope.panelMeta.timeInfo += ' timeshift ' + timeShift;
+        $scope.range.from = kbn.parseDateMath(timeShift, $scope.range.from);
+        $scope.range.to = kbn.parseDateMath(timeShift, $scope.range.to);
+        $scope.rangeUnparsed = $scope.range;
+      }
 
       if ($scope.panel.maxDataPoints) {
         $scope.resolution = $scope.panel.maxDataPoints;

src/test/specs/kbn-format-specs.js

@@ -69,4 +69,15 @@ define([
 
   });
 
+  describe('relative time to date parsing', function() {
+    it('should handle negative time', function() {
+      var date = kbn.parseDateMath('-2d', new Date(2014,1,5));
+      expect(date.getTime()).to.equal(new Date(2014, 1, 3).getTime());
+    });
+    it('should handle multiple math expressions', function() {
+      var date = kbn.parseDateMath('-2d-6h', new Date(2014, 1, 5));
+      expect(date.toString()).to.equal(new Date(2014, 1, 2, 18).toString());
+    });
+  });
+
 });