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Dates (using them, not getting them)  RSS feed

 
Ranch Hand
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Can anybody recommend a good resource for learning about Java Dates?

I don't completely understand the relationship between GregorianCalendars and Dates and Locales. I have read the API and checked a couple books and I'm still fuzzy. It seems more complicated than it needs to be.

Has anybody here read a clear explaination of how to use Dates maybe with some best practices mixed in?
 
Greenhorn
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Bartender
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Eclipse IDE Java Ruby
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Here's my approach to dates:

1). java.util.Date works well for storing a date value. This is about all it is good for. Fortunately, storing Dates is a commmon thing, so I use it a lot.

2). Use java.util.Calendar for date manipulations (adding time to dates, etc.)

3). Use milliseconds for calculating differences between dates. (Obtainable from a date.getTime(), or from a calendaer as calendar.getTime().getTime());

4). Use java.text.SimpleDateFormat for formatting dates to print -- unless you have to worry about locales. Then use the DateFormatter.getXXXInstance methods to get the locale-specific formats.

5). Unless you have to, don't worry about locales. But do use java.util.Calendar.getInstance() to get a locale-specific instance instead of using a GregorianCalendar directly. (In most cases it will return a GregorianCalendar anyway....)
 
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hi,

Best way use Calendar class it contains, all the facilities, like DAY,MONTH, YEAR, DAY_OF_MONTH etc.

Thanx.
 
Sheriff
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Only the first of those links if any use. The second links to java.sql.Date which is not a general purpose class. The third shows the use of a Calendar object, and now that LocalDate is available, you shou‍ld no longer use Calendar or java.util.Date.
 
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