Words and Numbers - Minutes

Time may be stated several ways using words. Examples include:

Eight o'clock8:00
Eight forty-seven8:47
Seven minutes after eight8:07
Forty-seven minutes past eight8:47
Twenty-seven after eight8:27
Six past eight8:06
Thirteen minutes before nine8:47
Three minutes until nine8:57
Thirteen minutes till nine8:47

What is the Numerical value for the time?