diff --git a/powerlevel9k.zsh-theme b/powerlevel9k.zsh-theme
index 443f7cc..76b1ac3 100644
--- a/powerlevel9k.zsh-theme
+++ b/powerlevel9k.zsh-theme
@@ -277,7 +277,12 @@ prompt_longstatus() {
 
 # System time
 prompt_time() {
-  $1_prompt_segment $DEFAULT_COLOR_INVERTED $DEFAULT_COLOR '%D{%H:%M:%S} '
+  local time_format='%D{%H:%M:%S} '
+  if [[ -n $POWERLEVEL9K_TIME_FORMAT ]]; then
+    time_format=$POWERLEVEL9K_TIME_FORMAT
+  fi
+
+  $1_prompt_segment $DEFAULT_COLOR_INVERTED $DEFAULT_COLOR $time_format
 }
 
 # Command number (in local history)