如何将日期字符串从 UTC 转换为 HIVE 中的特定时区? [英] How to convert a Date String from UTC to Specific TimeZone in HIVE?

问题描述

我的 Hive 表有一个带有 UTC 日期字符串的日期列.我想获取特定 EST 日期的所有行.

My Hive table has a date column with UTC date strings. I want to get all rows for a specific EST date.

我正在尝试执行以下操作:

I am trying to do something like the below:

Select * 
from TableName T
where TO_DATE(ConvertToESTTimeZone(T.date))  = "2014-01-12" 

我想知道是否有 ConvertToESTTimeZone 的函数，或者如何实现?

I want to know if there is a function for ConvertToESTTimeZone, or how I can achieve that?

我尝试了以下方法但不起作用(我的默认时区是 CST):

I tried the following but it doesnt work (my default timezone is CST):

TO_DATE(from_utc_timestamp(T.Date) = "2014-01-12" 
TO_DATE( from_utc_timestamp(to_utc_timestamp (unix_timestamp (T.date), 'CST'),'EST'))

提前致谢.

更新:

Strange behavior. When I do this:

select "2014-01-12T15:53:00.000Z", TO_DATE(FROM_UTC_TIMESTAMP(UNIX_TIMESTAMP("2014-01-12T15:53:00.000Z", "yyyy-MM-dd'T'hh:mm:ss.SSS'Z'"), 'EST')) 
from TABLE_NAME T1
limit 3

我明白了

    _c0                          _c1
0   2014-01-12T15:53:00.000Z    1970-01-16
1   2014-01-12T15:53:00.000Z    1970-01-16
2   2014-01-12T15:53:00.000Z    1970-01-16

推荐答案

您的系统时区 CST 与在 Hive 中将 UTC 转换为 EST 无关.您应该能够获得正确的结果:

Your system timezone CST doesn't matter for converting UTC to EST in Hive. You should be able to get the correct results with:

TO_DATE(FROM_UTC_TIMESTAMP(UNIX_TIMESTAMP(T.date, "yyyy-MM-dd'T'hh:mm:ss.SSS'Z'") * 1000, 'EST'))

请注意，因为 UNIX_TIMESTAMP 返回秒，您将丢失时间戳的毫秒部分.

Note that because UNIX_TIMESTAMP returns seconds, you will lose the millisecond component of your timestamp.

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