diff --git a/libozsh.zsh b/libozsh.zsh
index bf4e4ab..517f304 100644
--- a/libozsh.zsh
+++ b/libozsh.zsh
@@ -55,7 +55,7 @@ function ozsh_update {
 }
 
 function ozsh_autoupdate {
-	local timediff=$(( ( $(strftime -r %Y-%m-%d $(date +%Y-%m-%d)) - $(strftime -r %Y-%m-%d $(cat $OZSH_LASTUPDATE_FILE)) ) / 86400 ))
+	local timediff=$(( ( $(date +%s) - $(cat $OZSH_LASTUPDATE_FILE) ) / 86400 ))
 
 	if [ "$timediff" -ge "7" ]; then
 		vared -p 'Would you like to update ozsh? [y/N]: ' -c answer