Changing Between 24 hour time system to 20 Hie time System

How we can change our 24 hour time system to 20 Hie time System.

Let say we have 3.00am (24 hour time system )
= (3/12)X10
It will equal to 2.50Hie am (20 Hie time system )

Let say we have 3.20am (24 hour time system )
= ((3+20/60)/12)X10
It will equal to 2.78Hie am (20 Hie time system )

Let say we have 1hour 40minutes (24 hour time system )
= ((1+40/60)/12)X10
It will equal to 1.16Hie (20 Hie time system )

Let say we have 20second (24 hour time system )
= ((20/3600)/12)X10
It will equal to 0.0046296Hie (20 Hie time system )