I changed my phone’s language from English (US) to Kenyan English, here is what happened

Annoyed by how WhatsApp keeps displaying dates in the nonsensical American way (04/23 not 23/04), I changed my phone’s language from English(US) to English (Kenya). A lot of interesting changes have appeared. Now WhatsApp says it’s 10.00 o’clock in the morning, not 10.00 a.m. Or 8.26 at night not 8.26 p.m. Lots of subtle differences …