presto unixtimestamp转标准日期

用到presto两个函数

1. from_unixtime

2.format_datetime

select
'1566748800000',
substr('1566748800000',1,10) as a,
from_unixtime(cast(substr('1566748800000',1,10) as int)) as b, -- 将13位毫秒级的unix timestamp截取到秒级别
format_datetime(from_unixtime(cast(substr('1566748800000',1,10) as int)),'yyyy-MM-dd')

转换结果

参考资料 https://prestodb.github.io/docs/current/functions/datetime.html