2 files changed, 73 insertions, 0 deletions
diff --git a/utils/time.go b/utils/time.go
new file mode 100644
index 000000000..7d5afdf8f
--- /dev/null
+++ b/utils/time.go
@@ -0,0 +1,23 @@
+package utils
+
+import (
+	"time"
+)
+
+func MillisFromTime(t time.Time) int64 {
+	return t.UnixNano() / int64(time.Millisecond)
+}
+
+func StartOfDay(t time.Time) time.Time {
+	year, month, day := t.Date()
+	return time.Date(year, month, day, 0, 0, 0, 0, t.Location())
+}
+
+func EndOfDay(t time.Time) time.Time {
+	year, month, day := t.Date()
+	return time.Date(year, month, day, 23, 59, 59, 999999999, t.Location())
+}
+
+func Yesterday() time.Time {
+	return time.Now().AddDate(0, 0, -1)
+}
diff --git a/utils/time_test.go b/utils/time_test.go
new file mode 100644
index 000000000..7d65046bf
--- /dev/null
+++ b/utils/time_test.go
@@ -0,0 +1,50 @@
+// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package utils
+
+import (
+	"testing"
+	"time"
+)
+
+var format = "2006-01-02 15:04:05.000000000"
+
+func TestMillisFromTime(t *testing.T) {
+	input, _ := time.Parse(format, "2015-01-01 12:34:00.000000000")
+	actual := MillisFromTime(input)
+	expected := int64(1420115640000)
+
+	if actual != expected {
+		t.Fatalf("TestMillisFromTime failed, %v=%v", expected, actual)
+	}
+}
+
+func TestYesterday(t *testing.T) {
+	actual := Yesterday()
+	expected := time.Now().AddDate(0, 0, -1)
+
+	if actual.Year() != expected.Year() || actual.Day() != expected.Day() || actual.Month() != expected.Month() {
+		t.Fatalf("TestYesterday failed, %v=%v", expected, actual)
+	}
+}
+
+func TestStartOfDay(t *testing.T) {
+	input, _ := time.Parse(format, "2015-01-01 12:34:00.000000000")
+	actual := StartOfDay(input)
+	expected, _ := time.Parse(format, "2015-01-01 00:00:00.000000000")
+
+	if actual != expected {
+		t.Fatalf("TestStartOfDay failed, %v=%v", expected, actual)
+	}
+}
+
+func TestEndOfDay(t *testing.T) {
+	input, _ := time.Parse(format, "2015-01-01 12:34:00.000000000")
+	actual := EndOfDay(input)
+	expected, _ := time.Parse(format, "2015-01-01 23:59:59.999999999")
+
+	if actual != expected {
+		t.Fatalf("TestEndOfDay failed, %v=%v", expected, actual)
+	}
+}