diff --git a/themes/rkj-repos.zsh-theme b/themes/rkj-repos.zsh-theme
index ba2a0dba6..4aa0d32cc 100644
--- a/themes/rkj-repos.zsh-theme
+++ b/themes/rkj-repos.zsh-theme
@@ -27,10 +27,18 @@ function mygit() {
   fi
 }
 
+function hour_format() {
+  if [[ -z ${ISO8601_HOURS+x} ]]; then
+    echo "I"
+  else
+    echo "H"
+  fi
+}
+
 function retcode() {}
 
 # alternate prompt with git & hg
-PROMPT=$'%{$fg_bold[blue]%}┌─[%{$fg_bold[green]%}%n%b%{$fg[black]%}@%{$fg[cyan]%}%m%{$fg_bold[blue]%}]%{$reset_color%} - %{$fg_bold[blue]%}[%{$fg_bold[white]%}%~%{$fg_bold[blue]%}]%{$reset_color%} - %{$fg_bold[blue]%}[%b%{$fg[yellow]%}'%D{"%Y-%m-%d %I:%M:%S"}%b$'%{$fg_bold[blue]%}]
+PROMPT=$'%{$fg_bold[blue]%}┌─[%{$fg_bold[green]%}%n%b%{$fg[black]%}@%{$fg[cyan]%}%m%{$fg_bold[blue]%}]%{$reset_color%} - %{$fg_bold[blue]%}[%{$fg_bold[white]%}%~%{$fg_bold[blue]%}]%{$reset_color%} - %{$fg_bold[blue]%}[%b%{$fg[yellow]%}'%D{"%Y-%m-%d %"$(hour_format)":%M:%S"}%b$'%{$fg_bold[blue]%}]
 %{$fg_bold[blue]%}└─[%{$fg_bold[magenta]%}%?$(retcode)%{$fg_bold[blue]%}] <$(mygit)$(hg_prompt_info)>%{$reset_color%} '
 PS2=$' \e[0;34m%}%B>%{\e[0m%}%b '