Converting the data in year month day hour and minutes to date in R

I am trying to convert the date as factor to date using “as.date” function in R. I have the date in the following format

2008-01-01 02:30

I tried to use the following command :

as.Date(mydata$Date, format="%y-%m-%d  %h:%mm")

Can somebody help me with this ? I was able to convert the format with no hour but getting difficulty with hour included.

Thank you.