Here are some ideas for earning the Time badge. Some activities are designed to be done in a patrol or unit, others are designed to be done at home.
Suggestions have been split into ideas for Guides aged under 10 and Guides aged over 10, but feel free to mix and match - as long as it is a challenge for the individual girl!
Play a Human Clock game – there is an example at this website.
Be able to explain the international date line to your patrol (here is a good explanation to get you started).