diff --git a/README.md b/README.md
index af7ce76..b7975ac 100644
--- a/README.md
+++ b/README.md
@@ -27,11 +27,6 @@ An oh-my-zsh theme;
 
 #### Trouble Shooting
 
-##### macOS, command not found: gdate
-
-* passion.zsh-theme depends on cmd ```gdate``` to get current time in milliseconds. get ```gdate``` on macOS by running ```brew install coreutils``` then ```source ~/.zshrc```;
-* see also: [#12](https://github.com/ChesterYue/ohmyzsh-theme-passion/issues/12);
-
 ##### Linux, command not found: bc
 
 * passion.zsh-theme depends on cmd ```bc``` to calculate the command running time cost. [get bc on Linux](https://www.tecmint.com/bc-command-examples/#:~:text=If%20you%20don%E2%80%99t%20have%20bc%20on%20your%20system%2C,command%20prompt%20and%20simply%20start%20calculating%20your%20expressions.) then ```source ~/.zshrc```;
diff --git a/passion.zsh-theme b/passion.zsh-theme
index 00d789b..a6076ca 100644
--- a/passion.zsh-theme
+++ b/passion.zsh-theme
@@ -1,19 +1,4 @@
 
-# gdate for macOS
-# REF: https://apple.stackexchange.com/questions/135742/time-in-milliseconds-since-epoch-in-the-terminal
-if [[ "$OSTYPE" == "darwin"* ]]; then
-    {
-        gdate
-    } || {
-        echo "\n$fg_bold[yellow]passion.zsh-theme depends on cmd [gdate] to get current time in milliseconds$reset_color"
-        echo "$fg_bold[yellow][gdate] is not installed by default in macOS$reset_color"
-        echo "$fg_bold[yellow]to get [gdate] by running:$reset_color"
-        echo "$fg_bold[green]brew install coreutils;$reset_color";
-        echo "$fg_bold[yellow]\nREF: https://github.com/ChesterYue/ohmyzsh-theme-passion#macos\n$reset_color"
-    }
-fi
-
-
 # time
 function real_time() {
     local color="%{$fg_no_bold[cyan]%}";                    # color in PROMPT need format in %{XXX%} which is not same with echo
@@ -151,7 +136,7 @@ current_time_millis() {
         time_millis="$(date +%s.%3N)";
     elif [[ "$OSTYPE" == "darwin"* ]]; then
         # macOS
-        time_millis="$(gdate +%s.%3N)";
+        time_millis="$(perl -MTime::HiRes -e 'printf("%.3f\n",Time::HiRes::time())')";
     elif [[ "$OSTYPE" == "cygwin" ]]; then
         # POSIX compatibility layer and Linux environment emulation for Windows
     elif [[ "$OSTYPE" == "msys" ]]; then