diff --git a/home/dot_zshrc.tmpl b/home/dot_zshrc.tmpl
index 888a6e2..a652122 100644
--- a/home/dot_zshrc.tmpl
+++ b/home/dot_zshrc.tmpl
@@ -111,3 +111,7 @@ BASE16_SHELL="$HOME/.config/base16-shell/"
 eval "$(/opt/homebrew/bin/brew shellenv)"
 {{ end }}
 eval "$(direnv hook zsh)"
+
+function reldate() {
+    date -v "${1}" "+%Y-%m-%d"
+}