how do you subset data frame beteen times in R -

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i have data frame called df:

structure(list(date = structure(c(1468555240, 1468555242, 1468555246,  1468569649, 1468555251, 1468555257, 1468641020, 1468641021, 1468641021,  1468641021, 1468641021, 1468641021), tzone = "", class = c("posixct",  "posixt")), scpu = c(7.28602, 9.49307, 7.70778, 8.51675, 6.97994,  8.46983, 4.14684, 2.51154, 3.27359, 1.84363, 2.47815, 3.29061 )), .names = c("date", "scpu"), row.names = c(na, -12l), class = "data.frame")

i data points between 12 noon 23:59, midnight. don't want data points after midnight 12 noon. how in r?

i've tried creating time column called t , did this:

subset(df, t<times(c("23:59:00"))&t>times(c("12:00:00"))

04:00 still shows on final subsetted data, ideas how this?

this should it: 

library(lubridate)  dfsub <- df[hour(df$date)>11,]

however, data has no values in time range. here's working example new data:

dat <- data.frame(datetime = seq(ymd_hms('2014-07-17 12:00:00'),                                          ymd_hms('2014-07-18 11:00:00'),                                          = 'hours'),                       misc = seq(1, 24)) datsub <- dat[hour(dat$datetime)>11,]

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