-Re: Timestamp, Epoch Time, Functions and other Frustrations
Mark Grover 2013-01-04, 16:30
Brad is correct, there is a JIRA about this already:
Sorry for the inconvenience.
On Fri, Jan 4, 2013 at 8:25 AM, Brad Cavanagh <[EMAIL PROTECTED]> wrote:
> Try multiplying your values by 1000, then running the conversions. I bet
> they expect milliseconds since the epoch instead of seconds.
> On 2013-01-04, at 8:03 AM, John Omernik <[EMAIL PROTECTED]> wrote:
> Greetings all. I am getting frustrated with the documentation and lack of
> intuitiveness in Hive relating to timestamps and was hoping I could post
> here and get some clarification or other ideas.
> I have a field that is a string, but is actually a 10 digit int
> representation of epoch time, I am going to list out the results of various
> Value = 1356588013
> from_unixtime(Value) = 2012-12-27 00:00:13 (Timezone CST on the system time,
> so that works)
> cast(value as timestamp) = 1970-01-16 10:49:48.013
> cast(cast(value as int) as timestamp = 1970-01-16 10:49:48.013
> from_utc_timestamp(starttime, 'GMT') = 1970-01-16 10:49:48.013
> from_utc_timestamp(starttime, 'CST') = 1970-01-16 04:49:48.013
> Epoch Converter - http://www.epochconverter.com/
> Thu, 27 Dec 2012 06:00:13 GMT - GMT Representation of the time
> Thu Dec 27 2012 00:00:13 GMT-6 - My Timezone representation
> Ok Given all of these representations... how do I get the Value ( a valid
> epoch time) into a GMT time basically, 2012-12-27 06:00:13 without just
> doing math. (Math is error prone on system as we move across timezone). Why
> doesn't the casting of the value to timestamp or even the casting of the int
> cast of the time stamp work? Why does it read 1970? This is very
> frustrating and should be more intuitive. Please advise.