Survey: How ISO 8601 date formatting should work in FreeMarker 2.3.17

The factors I'm not 100% sure about is:
- Using UTC VS local time zone
- Printing the time zone offset (including "Z") or not

The current plan is that if you have:

  ${exp?iso_utc}

Then, depending on the type of the expression value:
- If it's a date-only value, it prints something like
  2010-05-09Z
- If it's a time-only value, it prints something like
  18:15:16Z
  or if the millisec part is not 0 then:
  18:15:16.008Z
- If it's a date-time value then it's like:
  2010-05-09T18:15:16Z
  or
  2010-05-09T18:15:16.008Z
- If it's not decided if which parts of the date is used (like if you drop
  a java.util.Date into the data-model), then just like with non-ISO
  formatting, the above will be an error, and you have to write something
  like:
  ${exp?date?iso_utc}
  ${exp?time?iso_utc}
  ${exp?datetime?iso_utc}

So as you can see:
- The time zone is always UTC
- The offset is always shown ("Z", since it's UTC), even for
  date-only values.

If you want to print with the local time zone (which is decided by the
"time_zone" setting of FreeMarker), then you have to write:

  ${exp?iso_local}

In this case instead of "Z" you will get an offset like ("+05:00").
The offset would be always shown here too.

If you don't want to show the offset then you had to write:

  ${exp?iso_utc_no}

or

  ${exp?iso_local_no}

where "no" stands for "No Offset". /-:

Opinions?

-- 
Best regards,
 Daniel Dekany


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