hugebear 发表于 2016-11-10 21:52 
我不确定啊,因为你没有解释这个数字到底是什么意思。什么叫“应该是毫秒级别”?看起来你自己也不确定?
嗯,是的,我确实不太确定,不过我又做了一下,
as.POSIXct(as.numeric(jos_new[,4])/1000,origin = "1970-01-01")
出来的结果是这样的
[1] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[6] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[11] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[16] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[21] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[26] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[31] "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST" "2016-11-07 CST"
[36] "2016-11-07 CST" "2016-11-07 CST" ,没有时分秒