common/log: Always output timestamps as UTC

src/github.com/matrix-org/dendrite/common/log.go

@@ -8,13 +8,24 @@ import (
 	"github.com/matrix-org/dugong"
 )
 
+type utcFormatter struct {
+	logrus.Formatter
+}
+
+func (f utcFormatter) Format(entry *logrus.Entry) ([]byte, error) {
+	entry.Time = entry.Time.UTC()
+	return f.Formatter.Format(entry)
+}
+
 // SetupLogging configures the logging format and destination(s).
 func SetupLogging(logDir string) {
-	formatter := &logrus.TextFormatter{
-		TimestampFormat:  "2006-01-02T15:04:05.000000000Z07:00",
-		DisableColors:    true,
-		DisableTimestamp: false,
-		DisableSorting:   false,
+	formatter := &utcFormatter{
+		&logrus.TextFormatter{
+			TimestampFormat:  "2006-01-02T15:04:05.000000000Z07:00",
+			DisableColors:    true,
+			DisableTimestamp: false,
+			DisableSorting:   false,
+		},
 	}
 	if logDir != "" {
 		_ = os.Mkdir(logDir, os.ModePerm)