ad_ts does not work with data.table

[fedemolina]

I'm using a data set with different time series, I'm store it as data.table
So in every iteration I filter by some condition:

DT[var1 == x, c("date", "var2")]

Error in rbindlist(l, use.names, fill, idcol) :
Class attribute on column 1 of item 2 does not match with column 1 of item 1.

This happen because date column is store as numeric(0), ie:

all_anoms <- data.frame(timestamp = numeric(0), count = numeric(0)) meanwhile column date is required to be POSIXct/POSIXlt