So, to complete Bill Dunlap's thought and combine it with your desired goal,
I believe this gets you what you wanted...
start.time <- as.POSIXct("2009-04-10 12:00:00")
event.times <- start.time + c(1,2,3,61,62,122,135,200)
event.values <- rnorm(length(event.times))
et <- data.frame(event.times,event.values)
et$trunc.times <- as.POSIXct(trunc(event.times, units="mins"))
data.frame(table(et$trunc.times))
Var1 Freq
1 2009-04-10 12:00:00 3
2 2009-04-10 12:01:00 2
3 2009-04-10 12:02:00 2
4 2009-04-10 12:03:00 1
-Wil Doane
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