[R] need to delete by time, not date

[Schatzi]

I have a matrix where one column has a date and another column has a time. I
need to delete all times before 6am. I had combined the Date and Time column
into DateTime.

Mat1:
Weight     Date  Time            
7.6 04/28/11 09:03 
8.4 04/29/11 03:11 
8.6 04/29/11 05:32 
8.6 04/29/11 09:53 
1.4 05/01/11 19:52 

I tried just picking up the time:

as.POSIXct(Mat1$Time, format = "%H:%M")

but this assigns the time value today's date.

The final matrix should look like:
Weight     Date  Time   
7.6 04/28/11 09:03 
8.6 04/29/11 09:53 
1.4 05/01/11 19:52 


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