diff --git a/libozsh.zsh b/libozsh.zsh
index 517f304..edf1767 100644
--- a/libozsh.zsh
+++ b/libozsh.zsh
@@ -36,7 +36,7 @@ function ozsh_load {
 }
 
 function ozsh_write_update_date {
-	echo $(date +%Y-%m-%d) > "$OZSH_LASTUPDATE_FILE"
+	echo $(date +%s) > "$OZSH_LASTUPDATE_FILE"
 }
 
 function ozsh_update {