make time formatting be optional

main.go

@@ -135,11 +135,18 @@ func (l *logger) println(line string) {
 	l.l.Lock()
 	defer l.l.Unlock()
 
+	if l.timeFmt != "" {
 		fmt.Fprintf(
 			l.outBuf,
-		"%s %c %s%s%c %s\n",
+			"%s %c ",
 			time.Now().Format(l.timeFmt),
 			l.sep,
+		)
+	}
+
+	fmt.Fprintf(
+		l.outBuf,
+		"%s%s%c %s\n",
 		l.pname,
 		strings.Repeat(" ", int(*l.maxPNameLen+1)-len(l.pname)),
 		l.sep,
@@ -167,10 +174,6 @@ type config struct {
 
 func (cfg config) init() (config, error) {
 
-	if cfg.TimeFormat == "" {
-		cfg.TimeFormat = "2006-01-02T15:04:05.000Z07:00"
-	}
-
 	if len(cfg.Processes) == 0 {
 		return config{}, errors.New("no processes defined")
 	}

pmux-example.yml

@@ -3,6 +3,8 @@
 # timeFormat defines the formatting of timestamps. See
 # https://pkg.go.dev/time#pkg-constants for more info on how the formatting
 # string works.
+#
+# If timeFormat isn't set then the time is not included in each log line.
 timeFormat: "2006-01-02T15:04:05.000Z07:00"
 
 # processes is the only required field, it must have at least one process