From jFreeChart Millisecond to java.util.Date

Question

Regarding jFreeChart's Millisecond,

How can I get a java.util.Date object from a Millisecond instance?

From the docs, it only seems possible to subtract the milliseconds within Millisecond.

Since a Millisecond object is constructed like so:

  Millisecond ms = new Millisecond(
           millisec, 
           second,
           minute,
           hour,
           day,
           month,
           year);

I should be able to extract a valid Date object as well.

Edit

I need a Date object that gives back the exact time up to the millisecond accurate.

Does .getStart() provide this?

[ANSWER]: YES

azurefrog · Accepted Answer · 2014-03-20T23:34:51.147

2

Millisecond is like any other RegularTimePeriod in JFreeChart, so you can just

    Date d = ms.getStart();

or

    Date d = ms.getEnd();

depending on whether you want a date referring to the beginning or the end of your millisecond (same value either way).

See The JFreeChart API for more info.

EDIT: Adding code here since comments kill formatting:

    Millisecond ms = new Millisecond();
    System.out.println(ms.getStart().getTime());
    System.out.println(ms.getEnd().getTime());

will print the same millisecond twice.

edited Mar 20 '14 at 23:34

answered Mar 20 '14 at 23:27

azurefrog

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so `.getStart()` will give me the exact date up to the millisecond I put in? (I'm working with millisecond data so this is crucial to know for me). And `.getEnd()` will give me the **next** millisecond? – Jean-Paul Mar 20 '14 at 23:28
1

No, it's still the same millisecond, since it only has millisecond precision. I added a snippet to my answer to demonstrate. – azurefrog Mar 20 '14 at 23:33

score 1 · Answer 2 · answered Mar 20 '14 at 23:27

1

As far as I can see the Millisecond Class represents the time period of a millisecond and I'd assume the the getStart and getEnd Methods inherited from RegularTimePeriod return (nearly) the same Date of which one is one you're looking for.

answered Mar 20 '14 at 23:27

Kai Huppmann

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I need the **exact** `Date` unfortunately (I am working with millisecond data) – Jean-Paul Mar 20 '14 at 23:31
As I said: millisecond represents the period of one millisecond in time. So you meed to decide if you want the start or the end - which probably will two consecutive milliseconds. – Kai Huppmann Mar 20 '14 at 23:36
Actually they are the same (see answer above) – Jean-Paul Mar 20 '14 at 23:37
1

Ahh... Thank's. Seems strange to me anyway, because I'd say the end of this millisecond is the start of the very next one. – Kai Huppmann Mar 20 '14 at 23:41

Whome · Answer 3 · 2014-03-21T11:28:11.897

0

(my answer was late) Perhaps you could use this code:

java.util.Date date = new java.util.Date(freeMillis.getMillisecond());

edit: scrap that, freeMillis.getMillisecond() returns just a millisecond part.

edited Mar 21 '14 at 11:28

answered Mar 20 '14 at 23:27

Whome

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Doesn't `.getMillisecond()` give back the millisecond only? – Jean-Paul Mar 20 '14 at 23:31
System.out.println(new Date(ms.getMillisecond())); doesn't work. It returns `Thu Jan 01 01:00:00 CET 1970` – Jean-Paul Mar 20 '14 at 23:33

From jFreeChart Millisecond to java.util.Date

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3 Answers3