fix: make range picker show actual range with ceiled to date (fix #175)

utils/date.go

@@ -10,7 +10,7 @@ func StartOfToday() time.Time {
 }
 
 func StartOfDay(date time.Time) time.Time {
-	return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
+	return FloorDate(date)
 }
 
 func StartOfWeek() time.Time {
@@ -29,6 +29,20 @@ func StartOfYear() time.Time {
 	return time.Date(ref.Year(), time.January, 1, 0, 0, 0, 0, ref.Location())
 }
 
+// FloorDate rounds date down to the start of the day
+func FloorDate(date time.Time) time.Time {
+	return date.Truncate(24 * time.Hour)
+}
+
+// CeilDate rounds date up to the start of next day if date is not already a start (00:00:00)
+func CeilDate(date time.Time) time.Time {
+	floored := FloorDate(date)
+	if floored == date {
+		return floored
+	}
+	return floored.Add(24 * time.Hour)
+}
+
 func SplitRangeByDays(from time.Time, to time.Time) [][]time.Time {
 	intervals := make([][]time.Time, 0)
 

utils/date_test.go

@@ -0,0 +1,30 @@
+package utils
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+	"time"
+)
+
+func TestDate_Ceil(t *testing.T) {
+	tests := []struct {
+		in  string
+		out string
+	}{
+		{
+			"02 Jan 06 15:04 MST",
+			"03 Jan 06 00:00 MST",
+		},
+		{
+			"03 Jan 06 00:00 MST",
+			"03 Jan 06 00:00 MST",
+		},
+	}
+
+	for _, test := range tests {
+		inDate, _ := time.Parse(time.RFC822, test.in)
+		outDate, _ := time.Parse(time.RFC822, test.out)
+		out := CeilDate(inDate)
+		assert.Equal(t, outDate, out)
+	}
+}