diff --git a/appveyor.yml b/appveyor.yml
index 701521fdd..f571585f7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -46,7 +46,7 @@ install:
   - ps: '& "C:\Program Files (x86)\NSIS\makensis.exe" gajim.nsi'
 
   # Push Installer Exe
-  - ps: $env:TIME_STRING=(get-date).ToString(‘d-M-yyyy’)
+  - ps: $env:TIME_STRING=(get-date -UFormat "%Y-%m-%d").ToString()
   - ps: Push-AppveyorArtifact Gajim.exe -FileName "Gajim-default-$($env:TIME_STRING).exe"
 
 build: off