format_ISO8601(as.Date("02-01-2018", format="%m-%d-%Y"))
format_ISO8601(as.POSIXct("2018-02-01 03:04:05", tz="EST"), usetz=TRUE)
format_ISO8601(as.POSIXct("2018-02-01 03:04:05", tz="EST"), precision="ymdhm")
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