I have a vector of hours. For example:

vec.hours <- c("15:52:00", "15:56:00", "12:10:00", "15:12:00",  "11:49:00" ,"13:35:00", "14:53:00")

I would like to round the hours to get the new hours that will be the nearest whole 5 minutes, like this.

round.hours <- c("15:50:00", "16:00:00", "12:10:00", "15:10:00",  "11:50:00" ,"13:35:00", "14:55:00" )

I tried this 

hour <- strptime(vec.hours , "%H:%M:%S")
round.hour <- round(hour , "mins")

But it isn't working.

After for each round.hours I want to do +/- one hour, for example like this:

hour.rd <- strptime(round.hours[1] , "%H:%M:%S")
hourM <- hour.rd - 3600
hourP <- hour.rd + 3600
l.tm <- timeSequence(from = hourM, to = hourP,format = "%H-%S-%M",by="5 min",FinCenter = "Europe/Zurich")

so, for 15:50:00 I have a vector of times from 14:50 until 16:50.

I dont know how to get round.hour from vec.hours.

Many thanks

r time
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