Half past six
15 degrees
I believe you're referring to "Tun Dr Mahathir described the [Malaysian] government as 'half-past six' with no guts after it scrapped a project to build a bridge to replace the Causeway because it could not secure the agreement of Singapore". "Half past six" is an idiom on it's own, slang mainly used in Malaysia and Singapore. In short though, it means: Careless, shoddy; incompetent, screwed up.
twenty past six is a time it means that it is 6:20
55 minutes
Half past six!
30 minutes after the hour. "Its half past 1." it's 1:30!
30 minutes past the hour.
In English it is 6.30. 18.30 or half past six. In many languages it is half seven though - such as German - halb sieben
Ten minutes past six.
20 past 6 ( twenty past six ), 6:20
To say "half past" in French, you can use the phrase "et demie." For example, if it is 6:30, you would say "six heures et demie."