[datatable-help] possible bug when running setkey on POSIXct column

[statquant]

Hello I might have found a bug.
I really cannot explain the following (please be indulgent as I narrowed
the most I could).

library(data.table)
DT = data.table(X=as.POSIXct( c(rep("15DEC2008:00:00:00",10)
,"15DEC2008:00:00:00",rep("17DEC2008:00:00:00",2)),
format="%d%b%Y:%H:%M:%S"),Y=c(1534,61,74,518,519,1519,1520,
1524,3127,29250,30609,43,7853))
setkey(DT,X,Y)

#Here is what I see after the sort

DT
             X     Y
 1: 2008-12-15  *1534*
 2: 2008-12-15    61
 3: 2008-12-15    74
 4: 2008-12-15   518
 5: 2008-12-15   519
 6: 2008-12-15  1519
 7: 2008-12-15  1520
 8: 2008-12-15  1524
 9: 2008-12-15  3127
10: 2008-12-15 29250
11: 2008-12-15 30609
12: 2008-12-17    43
13: 2008-12-17  7853

#I thought that it was a POSIXct problem but if I can get the correct
answer like this:

DT[order(X,Y),]
             X     Y
 1: 2008-12-15    61
 2: 2008-12-15    62
 3: 2008-12-15    74
 4: 2008-12-15   518
 5: 2008-12-15   519
 6: 2008-12-15  1519
 7: 2008-12-15  1520
 8: 2008-12-15  1524
 9: 2008-12-15  3127
10: 2008-12-15 29250
11: 2008-12-15 30609
12: 2008-12-17    43
13: 2008-12-17  7853

#Here is my session (just launched it)

R> sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C
LC_TIME=C
 [4] LC_COLLATE=en_GB.UTF-8     LC_MONETARY=fr_FR.UTF-8
LC_MESSAGES=en_GB.UTF-8
 [7] LC_PAPER=C                 LC_NAME=C
LC_ADDRESS=C
[10] LC_TELEPHONE=C             LC_MEASUREMENT=fr_FR.UTF-8
LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices datasets  utils     methods   base

other attached packages:
[1] data.table_1.8.7 inline_0.3.10    Rcpp_0.10.2      vimcom_0.9-5
setwidth_1.0-2
[6] colorout_0.9-9
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