[jira] [Created] (OOZIE-2130) Add EL Function for offsetting a date by a timezone amount including DST

["Robert Kanter (JIRA)" <ji...@apache.org>]

Robert Kanter created OOZIE-2130:
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             Summary: Add EL Function for offsetting a date by a timezone amount including DST
                 Key: OOZIE-2130
                 URL: https://issues.apache.org/jira/browse/OOZIE-2130
             Project: Oozie
          Issue Type: New Feature
    Affects Versions: trunk
            Reporter: Robert Kanter
            Assignee: Robert Kanter


If a Coordinator has a data dependency, you can use the {{tzOffset}} EL Function to get the offset from the dataset timezone to the coordinator timezone (including DST), so that you can pass to your workflow a time in your timezone.  We also have a generic {{dateOffset}} EL Function that lets you offset a date by a specific amount.  For users not using a data dependency who want to take into account a timezone offset (including DST), they cannot use the {{tzOffset}} function, and the {{dateOffset}} function is not enough.

We should add a {{dateTzOffset}} function that takes an arbitrary date and a timezone that will offset the given date by the given timezone relative to the Oozie processing timezone, including DST.

In other words, it's like the {{dateOffset}} function, but instead of giving it a fixed offset, you gave it the difference between the Oozie processing timezone and the given timezone, at the time of the given date.

For example:
{noformat}
${coord:dateTzOffset("2012-06-13T00:00Z", "America/Los_Angeles")}
{noformat}
would evaluate to "2012-06-12T17:00Z" (-0700 in Summer)
and
{noformat}
${coord:dateTzOffset("2012-12-13T00:00Z", "America/Los_Angeles")}
{noformat}
would evaluate to "2012-12-12T16:00Z" (-0800 in Winter)



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