Jasper报表中的SimpleDateFormat + java.sql.Timestamp

Question

I have a timezone-delicate report in Jasper and I can't really seem to figure out how to show a few dates relative to a timezone.

I have a view which returns dates with the following format:

"2015-03-02 11:45:00+01"

"2015-03-02 23:59:59+01"

"2015-03-03 00:00:00+01"

"2015-03-03 08:00:00+01"

"2015-03-03 09:20:00+01"

"2015-03-03 11:00:00+01"

"2015-03-03 09:00:00+01"

"2015-03-03 09:30:00+01"

etc (notice the +01 at the end)

In my report, I have:

new SimpleDateFormat("HH:mm", $P{REPORT_LOCALE}).format($F{start_date});

However, for example, for "2015-03-02 11:45:00+01" I don't get 12:45 shown, I get 11:45.

Also, I need to sum-up the hours (they're intervals) and this gives me a 1hr (in this case) error.

Can anyone help me show the correct hour?

Thanks!

Answer 1

SimpleDateFormat takes a Date , not a Calendar - which means it can't be provided the time zone in the value itself.

Assuming you need to stick with SimpleDateFormat (rather than using Joda Time or Java 8's java.time , for example) then you'll need to set the time zone on the SimpleDateFormat itself. If you need to take the time zone from the data (rather than having a report-wide zone) then you'll need to call setTimeZone before formatting each value - but of course, you'll also need to make sure you've got the time zone in the value, and java.sql.Timestamp doesn't have any notion of a time zone, as far as I'm aware.