[R] Subset a datafram according to time

[NickNz125]

PREFERED WAY OF DOING IT 
I have a data set of observations every second for a month long period, I
want to extract the observations according to the  date & time of another
data frame ( the other data frame is in the same format). I want to do this
to match these  observations   to my test observations (in the other data
frame) which are done every 6 minutes. So basically im shrinking the data
frame of second observations to only display the date time observation every
6 minutes.

ALTERNATIVE WAY
In other words I just wanna extract every 6 minute observation value from
this dataframe of everysecond observations

date                time            observations
02/08/2011 00:00	 1.165	
02/08/2011 00:01	 1.241
02/08/2011 00:02	 1.232


Im pretty new to the porgram done 2 days on it learning and learning, im
getting my head around it.

Help would be much appreciated.

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