April 22

First secret, it is called Indian stretchable time correctly. When you hear I will be ready in 10 minutes, it could be 2 hours or even more. I believe this is specific to different Asian countries.

The interesting way how you can interpret, why they have +30 minutes time-zone. Look at this image,

Picture 2.png

Rotate Clock 180 which is showing Indian time, change the digits and whoila !!! London time is now.

P.S. Ok, it works only for quarters, 0 15 30 45 minutes.