add license header to mono (#861)

utils/mono/mono.go

@@ -1,3 +1,17 @@
+// Copyright 2023 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package mono
 
 import "time"
@@ -12,13 +26,13 @@ func FromTime(t time.Time) time.Time {
 }
 
 func Now() time.Time {
-	return FromTime(time.Now())
+	return epoch.Add(time.Since(epoch))
 }
 
 func UnixNano() int64 {
 	return epochNano + int64(time.Since(epoch))
 }
 
 func UnixMicro() int64 {
-	return (epochNano + int64(time.Since(epoch))) / 1000
+	return UnixNano() / 1000
 }