R data.table - Need to convert char type data.table column to date type : I have a data.table with a column named 'Date'and type char and it looks like below. I need to convert this to date type column so that i can perform date operations.

Date
"10/11/2018"
"13/11/2013"
"22/11/2011"
"--"
"--"
"10/11/2018"

I tried this, but doesnt work - MyTable$Date <- as.POXISlt(MyTable$Date)