[jira] Commented: (PIG-1151) Date Conversion + Arithmetic UDFs

["Dmitriy V. Ryaboy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792021#action_12792021 ] 

Dmitriy V. Ryaboy commented on PIG-1151:
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Yes, these would be quite useful, please contribute!

Perhaps put them in a new package, piggybank.date


> Date Conversion + Arithmetic UDFs
> ---------------------------------
>
>                 Key: PIG-1151
>                 URL: https://issues.apache.org/jira/browse/PIG-1151
>             Project: Pig
>          Issue Type: New Feature
>    Affects Versions: 0.5.0
>            Reporter: sam rash
>            Priority: Minor
>
> I would like to offer up some very simple data UDFs I have that wrap JodaTime (apache 2.0 license, http://joda-time.sourceforge.net/license.html) and operate on ISO8601 date strings.
> (for piggybank).  Please advise if these are appropriate.
> 1. Date Arithmetic
> takes an input string: 
> 2009-01-01T13:43:33.000Z
> (and partial ones such as 2009-01-02)
> and a timespan (as millis or as string shorthand)
> returns an ISO8601 string that adjusts the input date by the specified timespan
> DatePlus(long timeMs); // + or - number works, is the # of millis
> DatePlus(String timespan); //10m = 10 minutes, 1h = 1 hour, 1172 ms, etc
> DateMinus(String timespan); //propose explicit minus when using string shorthand for time periods
> 2. Date Comparison (when you don't have full strings that you can use string compare with):
> DateIsBefore(String dateString); //true if lhs is before rhs
> DateIsAfter(String dateString); //true if lsh is after rhs
> 3. date trunc functions:
> takes partial ISO8601 strings and truncates to:
> toMinute(String dateString);
> toHour(String dateString);
> toDay(String dateString);
> toWeek(String dateString);
> toMonth(String dateString);
> toYear(String dateString);
> if any/all are helpful, I'm happy to contribute to pig

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