diff --git a/main.go b/main.go
index 4472132..6318371 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"sync"
 	"time"
 )
@@ -41,7 +42,8 @@ func New(name string, maxFileSize int64) (logger *Logger, err error) {
 		}
 	}
 
-	timestamp := "_" + time.Now().Format(time.RFC3339)
+	date := strings.Split(time.Now().Format(time.RFC3339), "T")[0]
+	timestamp := "_" + date
 	path := filepath.Join(logDirName, logger.outputFileName+timestamp+".txt")
 	logger.outputFile, err = os.Create(path)
 	if err != nil {