diff --git a/main.go b/main.go
index aab07e5..6bc0f55 100644
--- a/main.go
+++ b/main.go
@@ -12,6 +12,8 @@ import (
 	"time"
 )
 
+const dateTimeFormat = "2006-01-02 15:04:05"
+
 // Block ...
 const (
 	MaxLogSize5MB   int64 = 5 * 1024 * 1024
@@ -38,25 +40,25 @@ type Logger struct {
 func New(name string, maxFileSize int64) (logger *Logger, err error) {
 	logger = &Logger{}
 
-	logger.outputFileName = name + "-log"
+	logger.outputFileName = name
 	logger.mu = &sync.Mutex{}
 	logger.maxFileSize = maxFileSize
 
 	err = os.Mkdir(logDirName, os.ModePerm)
 	if err != nil {
 		if !os.IsExist(err) {
-			fmt.Printf("logger: mkdir: couldn't create event log directory\n")
+			fmt.Fprintf(os.Stderr, "gologger: couldn't create event log directory: %s\n", err.Error())
 			return nil, err
 		}
 	}
 
-	date := strings.Replace(time.Now().Format(time.RFC3339), ":", ".", -1)
-	logger.outputFileName += "_" + date
+	date := strings.Replace(time.Now().Format(dateTimeFormat), ":", ".", -1)
+	logger.outputFileName += " " + date
 	logger.fullName = logger.outputFileName + ".txt"
 	path := filepath.Join(logDirName, logger.fullName)
 	logger.outputFile, err = os.Create(path)
 	if err != nil {
-		fmt.Printf("logger: new: couldn't create event log file\n")
+		fmt.Fprintf(os.Stderr, "gologger: couldn't create event log file: %s\n", err.Error())
 		return nil, err
 	}
 
@@ -73,7 +75,7 @@ func (l *Logger) Log(format string, v ...interface{}) {
 	defer l.mu.Unlock()
 
 	msg := fmt.Sprintf(format, v...)
-	s := time.Now().Format(time.RFC3339) + ": " + msg + "\n"
+	s := time.Now().Format(dateTimeFormat) + ": " + msg + "\n"
 	if l.shouldSplit(len(s)) {
 		l.split()
 	}
@@ -83,7 +85,7 @@ func (l *Logger) Log(format string, v ...interface{}) {
 // Print ...
 func (l *Logger) Print(format string, v ...interface{}) {
 	msg := fmt.Sprintf(format, v...)
-	fmt.Printf("%s: %s\n", time.Now().Format(time.RFC3339), msg)
+	fmt.Printf("%s: %s\n", time.Now().Format(dateTimeFormat), msg)
 }
 
 // PrintTrace ...
@@ -91,7 +93,7 @@ func (l *Logger) PrintTrace(format string, v ...interface{}) {
 	_, file, line, _ := runtime.Caller(1)
 
 	msg := fmt.Sprintf(format, v...)
-	fmt.Printf("%s: %s %d: %s\n", time.Now().Format(time.RFC3339), file, line, msg)
+	fmt.Printf("%s: %s %d: %s\n", time.Now().Format(dateTimeFormat), file, line, msg)
 }
 
 // Trace ...
@@ -105,7 +107,7 @@ func (l *Logger) Trace(format string, v ...interface{}) {
 
 	_, file, line, _ := runtime.Caller(1)
 	msg := fmt.Sprintf(format, v...)
-	s := fmt.Sprintf("%s: %s %d: %s\n", time.Now().Format(time.RFC3339), file, line, msg)
+	s := fmt.Sprintf("%s: %s %d: %s\n", time.Now().Format(dateTimeFormat), file, line, msg)
 
 	if l.shouldSplit(len(s)) {
 		l.split()
@@ -129,7 +131,7 @@ func (l *Logger) LogHTTPRequest(req *http.Request, userID string) string {
 
 	b.WriteString("Request:\n")
 	// CLF-like header
-	fmt.Fprintf(&b, "%s %s %s\n", req.RemoteAddr, userID, time.Now().Format(time.RFC3339))
+	fmt.Fprintf(&b, "%s %s %s\n", req.RemoteAddr, userID, time.Now().Format(dateTimeFormat))
 
 	body, err := httputil.DumpRequest(req, true)
 	if err != nil {
@@ -171,7 +173,7 @@ func (l *Logger) Close() {
 
 	err := l.outputFile.Close()
 	if err != nil {
-		fmt.Printf("logger: on exit: couldn't close event log file\n")
+		fmt.Fprintf(os.Stderr, "gologger: couldn't close event log file: %s\n", err.Error())
 	}
 }
 
@@ -183,7 +185,7 @@ func (l *Logger) split() {
 	// close old file
 	err := l.outputFile.Close()
 	if err != nil {
-		fmt.Printf("logger: split: couldn't close event file\n")
+		fmt.Fprintf(os.Stderr, "gologger: split: couldn't close event file\n")
 		return
 	}
 
@@ -194,7 +196,7 @@ func (l *Logger) split() {
 	l.outputFile, errnew = os.Create(path)
 
 	if errnew != nil {
-		fmt.Printf("logger: split: couldn't create event log file\n")
+		fmt.Fprintf(os.Stderr, "gologger: couldn't create new event log file: %s\n", err.Error())
 	}
 }
 
@@ -202,4 +204,3 @@ func (l *Logger) shouldSplit(nextEntrySize int) bool {
 	stats, _ := l.outputFile.Stat()
 	return int64(nextEntrySize) >= (l.maxFileSize - stats.Size())
 }
-