feat: make logger time format configurable via config.json

- Add SetTimeFormat() function to apply time format to both console and file loggers
- Apply zerolog.TimeFieldFormat for JSON file output consistency
- Thread-safe configuration with mutex protection
- Add LoggerConfig struct to main Config with TimeFormat field
- Add example configuration to config.example.json

config/config.example.json

@@ -510,6 +510,9 @@
   "voice": {
     "echo_transcription": false
   },
+  "logger": {
+    "time_format": "15:04:05"
+  },
   "gateway": {
     "host": "127.0.0.1",
     "port": 18790

pkg/config/config.go

@@ -10,6 +10,7 @@ import (
 	"github.com/caarlos0/env/v11"
 
 	"github.com/sipeed/picoclaw/pkg/fileutil"
+	"github.com/sipeed/picoclaw/pkg/logger"
 )
 
 // rrCounter is a global counter for round-robin load balancing across models.
@@ -74,6 +75,10 @@ func (f *FlexibleStringSlice) UnmarshalText(text []byte) error {
 	return nil
 }
 
+type LoggerConfig struct {
+	TimeFormat string `json:"time_format,omitempty"`
+}
+
 type Config struct {
 	Agents    AgentsConfig    `json:"agents"`
 	Bindings  []AgentBinding  `json:"bindings,omitempty"`
@@ -86,6 +91,7 @@ type Config struct {
 	Heartbeat HeartbeatConfig `json:"heartbeat"`
 	Devices   DevicesConfig   `json:"devices"`
 	Voice     VoiceConfig     `json:"voice"`
+	Logger    LoggerConfig    `json:"logger,omitempty"`
 	// BuildInfo contains build-time version information
 	BuildInfo BuildInfo `json:"build_info,omitempty"`
 }
@@ -854,6 +860,11 @@ func LoadConfig(path string) (*Config, error) {
 		return nil, err
 	}
 
+	// Apply logger configuration if present
+	if cfg.Logger.TimeFormat != "" {
+		logger.SetTimeFormat(cfg.Logger.TimeFormat)
+	}
+
 	return cfg, nil
 }
 

pkg/logger/logger.go

@@ -44,7 +44,7 @@ func init() {
 
 		consoleWriter := zerolog.ConsoleWriter{
 			Out:        os.Stdout,
-			TimeFormat: "15:04:05", // TODO: make it configurable???
+			TimeFormat: "15:04:05",
 		}
 
 		logger = zerolog.New(consoleWriter).With().Timestamp().Logger()
@@ -52,6 +52,23 @@ func init() {
 	})
 }
 
+// SetTimeFormat updates the logger's time format dynamically at runtime for both console and file.
+func SetTimeFormat(format string) {
+	if format == "" {
+		return
+	}
+	mu.Lock()
+	defer mu.Unlock()
+	
+	// Apply format to zerolog's global JSON timestamp for file output
+	zerolog.TimeFieldFormat = format
+
+	logger = zerolog.New(zerolog.ConsoleWriter{
+		Out:        os.Stdout,
+		TimeFormat: format,
+	}).With().Timestamp().Logger()
+}
+
 func SetLevel(level LogLevel) {
 	mu.Lock()
 	defer mu.Unlock()