diff --git a/apps/sleeplog/interface.html b/apps/sleeplog/interface.html
index 74b90d9cb..7209a50ea 100644
--- a/apps/sleeplog/interface.html
+++ b/apps/sleeplog/interface.html
@@ -53,7 +53,7 @@ function getFnList() {
     files = files.map(file => {
       var ret = {
         bName: file,
-        date = (parseInt(file.match(/\d{4}/)[0]) + 0.25) * 12096E5,
+        date = (parseInt(file.substr(9, 4)) + 0.25) * 12096E5,
       }
       ret.dName = new Date(ret.date).toISOString().substr(0, 10) + "_" + new Date(ret.date + 12096E5).toISOString().substr(5, 5);
       ret.dateA = new Date(ret.date).toLocaleDateString(undefined);