Extract a date from a date-time object in a data frame

## create a miniature example data frame
 > z = data.frame(time=Sys.time())
 > z
                 time
1 2009-09-14 11:56:42
 > as.Date(z$time)
[1] "2009-09-14"

Extract a date from a date-time object in a data frame

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