Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/utils/time_test.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package utils
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+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)
+
+	assert.Equal(t, expected, actual)
+}
+
+func TestYesterday(t *testing.T) {
+	actual := Yesterday()
+	expected := time.Now().AddDate(0, 0, -1)
+
+	assert.Equal(t, expected.Year(), actual.Year())
+	assert.Equal(t, expected.Day(), actual.Day())
+	assert.Equal(t, expected.Month(), actual.Month())
+}
+
+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")
+
+	assert.Equal(t, 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")
+
+	assert.Equal(t, expected, actual)
+}