This plugin has PlaceholderAPI support! This is a plugin that restarts your server after time specified in the config file. Default is 1 hour.
You can set if you want a countdown and how long to countdown.
You can set the countdown message.
You can set if you want to kick the play and what message.
All of the messages have placeholder api support.
If you don't use PlaceholderAPI be sure to change the default kick message as it use the %player_name% placeholder.