as.ITime(character(0)) fails

[arunsrinivasan]

require(data.table)
as.ITime(character(0))
# Error in substring(paste("0", hh, sep = ""), nchar(paste(hh))) : 
#   invalid substring arguments

The issue is very likely in format.ITime. I think the behaviour should be similar to as.Date(), as.IDate() and as.POSIXct().

[MichaelChirico]

x = as.ITime(character(0))

is OK.

so it's print(x) causing the issue (more specifically, format.ITime, like you suggested).

We've got

#stylized from format.ITime
x = structure(integer(0), class = "ITime")
hh = x %/% 3600L
ss = paste("0", hh, sep = "")
nn = nchar(paste(hh))
#Error caused by:
substring(ss, nn)

We can just replace the substring bit with a sprintf call, I think... PRing now