Bonjour Catherine ! Indeed, "treize heures moins cinq" actually means "12:55", so thanks for pointing it out to us! We actually changed to "vingt heures moins cinq" to highlight the difference between 7:55 and 19:55 ! Merci!

Following your post, I decided to completely upgrade this lesson, to make it even clearer!!! Have a look there: https://www.french-test.com/revision/grammar/how-to-tell-the-time-in-french-simple