diff --git a/plugins/runtime/runtime.plugin.zsh b/plugins/runtime/runtime.plugin.zsh
new file mode 100644
index 000000000..ef497e6d9
--- /dev/null
+++ b/plugins/runtime/runtime.plugin.zsh
@@ -0,0 +1,26 @@
+# Simple plugin to calculate the time since the last command was run.
+# This is a proxy to the runtime when used in the prompt.
+#
+# Copyright, 2018, Olivier Mehani <shtrom+zsh@ssji.net>, MIT licensed
+#
+local _RUNTIME_FILE=$(umask 7077; mktemp /tmp/zsh_runtime.$$.XXXXXX)
+
+function runtime() {
+	local last=$(cat ${_RUNTIME_FILE})
+	if [[ -n $last ]]; then
+		echo "$(date '+%s')-$last" | bc -ql
+		echo > ${_RUNTIME_FILE}
+	fi
+}
+
+function runtime_preexec() {
+	date '+%s' > ${_RUNTIME_FILE}
+}
+
+function runtime_zshexit() {
+	rm ${_RUNTIME_FILE}
+}
+
+autoload -U add-zsh-hook
+add-zsh-hook preexec runtime_preexec
+add-zsh-hook zshexit runtime_zshexit