i want run 1 minute data trading app through r program i've written. far of xts objects have been daily bars yahoo, etc. how create time part of xts index? note date & time in first 2 columns. possible there missing dates, it's pretty guaranteed there missing minutes. there should not duplicates. (i'll check myself) thanks library(timedate) testdata = structure(list(x = 1:6, date = structure(c(1l, 1l, 1l, 1l, 1l, 1l), .label = "07/01/1998", class = "factor"), time = structure(1:6, .label = c("06:31", "06:34", "06:35", "06:36", "06:38", "06:39"), class = "factor"), open = c(114.06, 114.11, 114.06, 114.09, 114.09, 114.06), high = c(114.06, 114.13, 114.13, 114.09, 114.09, 114.13), low = c(114, 114.06, 114.06, 114.03, 114.06, 114.06), close = c...