diff --git a/fish/.config/fish/functions/certexpiry.fish b/fish/.config/fish/functions/certexpiry.fish
new file mode 100644
index 0000000..f31369c
--- /dev/null
+++ b/fish/.config/fish/functions/certexpiry.fish
@@ -0,0 +1,4 @@
+function certexpiry
+    openssl s_client -connect $argv[1] 2>/dev/null | openssl x509 -noout -dates
+end
+