tech(alerting): add graphite dateformat replacer

pkg/tsdb/graphite/graphite.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/url"
+	"strings"
 	"time"
 
 	"github.com/grafana/grafana/pkg/log"
@@ -30,7 +31,7 @@ func (e *GraphiteExecutor) Execute(queries tsdb.QuerySlice, context *tsdb.QueryC
 	result := &tsdb.BatchResult{}
 
 	params := url.Values{
-		"from":          []string{context.TimeRange.From},
+		"from":          []string{formatTimeRange(context.TimeRange.From)},
 		"until":         []string{context.TimeRange.To},
 		"format":        []string{"json"},
 		"maxDataPoints": []string{"500"},
@@ -76,3 +77,7 @@ func (e *GraphiteExecutor) Execute(queries tsdb.QuerySlice, context *tsdb.QueryC
 	result.QueryResults["A"] = queryRes
 	return result
 }
+
+func formatTimeRange(input string) string {
+	return strings.Replace(strings.Replace(input, "m", "min", -1), "M", "mon", -1)
+}