Hi @majidmad thanks for the kind words. I’m not sure if I understand the question 100%, so here are two points to consider:
If you’re asking about changing the format of the time (including am or pm, etc), the plugin uses the default time format specified in the WordPress options under Settings > General, so you could customize that in the settings there.
If you’re asking about changing the timezone (your server is set in one timezone, but you want the times you be recorded in GMT, not in your server’s timezone), that’s something you’d have to set up inside your Google Sheet. Here are some helpful instructions on StackOverflow for how to do that.