diff --git a/public/app/plugins/datasource/prometheus/datasource.ts b/public/app/plugins/datasource/prometheus/datasource.ts
index 89828d14d33..a763b2f92ea 100644
--- a/public/app/plugins/datasource/prometheus/datasource.ts
+++ b/public/app/plugins/datasource/prometheus/datasource.ts
@@ -62,8 +62,8 @@ export function PrometheusDatasource(instanceSettings, $q, backendSrv, templateS
   // Called once per panel (graph)
   this.query = function(options) {
     var self = this;
-    var start = getPrometheusTime(options.range.from, false);
-    var end = getPrometheusTime(options.range.to, true);
+    var start = this.getPrometheusTime(options.range.from, false);
+    var end = this.getPrometheusTime(options.range.to, true);
 
     var queries = [];
     var activeTargets = [];
@@ -172,8 +172,8 @@ export function PrometheusDatasource(instanceSettings, $q, backendSrv, templateS
       step: '60s'
     };
 
-    var start = getPrometheusTime(options.range.from, false);
-    var end = getPrometheusTime(options.range.to, true);
+    var start = this.getPrometheusTime(options.range.from, false);
+    var end = this.getPrometheusTime(options.range.to, true);
     var self = this;
 
     return this.performTimeSeriesQuery(query, start, end).then(function(results) {
@@ -279,10 +279,10 @@ export function PrometheusDatasource(instanceSettings, $q, backendSrv, templateS
     return metricName + '{' + labelPart + '}';
   };
 
-  function getPrometheusTime(date, roundUp): number {
+  this.getPrometheusTime = function(date, roundUp) {
     if (_.isString(date)) {
       date = dateMath.parse(date, roundUp);
     }
     return Math.ceil(date.valueOf() / 1000);
-  }
+  };
 }
diff --git a/public/app/plugins/datasource/prometheus/metric_find_query.js b/public/app/plugins/datasource/prometheus/metric_find_query.js
index f449978be81..04149881d40 100644
--- a/public/app/plugins/datasource/prometheus/metric_find_query.js
+++ b/public/app/plugins/datasource/prometheus/metric_find_query.js
@@ -51,9 +51,11 @@ function (_) {
         });
       });
     } else {
+      var start = this.datasource.getPrometheusTime(this.range.from, false);
+      var end = this.datasource.getPrometheusTime(this.range.to, true);
       url = '/api/v1/series?match[]=' + encodeURIComponent(metric)
-        + '&start=' + (this.range.from.valueOf() / 1000)
-        + '&end=' + (this.range.to.valueOf() / 1000);
+        + '&start=' + start
+        + '&end=' + end;
 
       return this.datasource._request('GET', url)
       .then(function(result) {
@@ -88,7 +90,8 @@ function (_) {
   };
 
   PrometheusMetricFindQuery.prototype.queryResultQuery = function(query) {
-    var url = '/api/v1/query?query=' + encodeURIComponent(query) + '&time=' + (this.range.to.valueOf() / 1000);
+    var end = this.datasource.getPrometheusTime(this.range.to, true);
+    var url = '/api/v1/query?query=' + encodeURIComponent(query) + '&time=' + end;
 
     return this.datasource._request('GET', url)
     .then(function(result) {
@@ -109,9 +112,11 @@ function (_) {
   };
 
   PrometheusMetricFindQuery.prototype.metricNameAndLabelsQuery = function(query) {
+    var start = this.datasource.getPrometheusTime(this.range.from, false);
+    var end = this.datasource.getPrometheusTime(this.range.to, true);
     var url = '/api/v1/series?match[]=' + encodeURIComponent(query)
-      + '&start=' + (this.range.from.valueOf() / 1000)
-      + '&end=' + (this.range.to.valueOf() / 1000);
+      + '&start=' + start
+      + '&end=' + end;
 
     var self = this;
     return this.datasource._request('GET', url)