diff --git a/lib/streams/DateRollingFileStream.js b/lib/streams/DateRollingFileStream.js
index 9da029a..0ac3ec5 100644
--- a/lib/streams/DateRollingFileStream.js
+++ b/lib/streams/DateRollingFileStream.js
@@ -17,7 +17,14 @@ function DateRollingFileStream(filename, pattern, options, now) {
   }
   this.pattern = pattern || '.yyyy-MM-dd';
   this.now = now || Date.now;
-  this.lastTimeWeWroteSomething = format.asString(this.pattern, new Date(this.now()));
+
+  if (fs.existsSync(filename)) {
+    var stat = fs.statSync(filename);
+    this.lastTimeWeWroteSomething = format.asString(this.pattern, stat.mtime);
+  } else {
+    this.lastTimeWeWroteSomething = format.asString(this.pattern, new Date(this.now()));
+  }
+
   this.baseFilename = filename;
   this.alwaysIncludePattern = false;