CODEWITHSUNDEEP
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dhblah
dhblah

Reputation: 10151

Use String.format() for Calendar vs. Date

Why if I use String.format(Date) it prints date in default timezone, but when I use String.format(Calendar) it prints in Calendar's timezone. Actually, the latter is what I need, but can I be sure that this behavior will persist?

Upvotes: 0

Views: 223

Answers (1)

dhblah
dhblah

Reputation: 10151

As I found from implementation of String.format (at least for JDK 1.5, it has printDateTime(Object, Locale) which contains such code:

    } else if (arg instanceof Date) {
    // Note that the following method uses an instance of the
    // default time zone (TimeZone.getDefaultRef().
    cal = Calendar.getInstance(l);
    cal.setTime((Date)arg);
    } else if (arg instanceof Calendar) {
    cal = (Calendar) ((Calendar)arg).clone();
    cal.setLenient(true);
    } else {

so if argument for String.format is of Date, Calendar.getInstance(Locale) is used, which creates calendar in default timezone, if argument is Calendar then calendar's time zone is used. Moreover, i didn't found any explicit description of this and that method is private, so It's impossible to assume that this behavior won't change.

Upvotes: 1

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