java.time

Question

I'm facing a problem in the Calendar.getInstance().getTime(), which returns an illogical month number. like 41/12/2017.

I tried to use new Date() to get the current time, also getting the same bug (illogical month number)

startDate.setText(new SimpleDateFormat("mm/dd/yy",Locale.getDefault()).format(Calendar.getInstance().getTime()).toString());

also the same when using new Date()

 startDate.setText(new SimpleDateFormat("mm/dd/yy",Locale.getDefault()).format(new Date()).toString());

I searched here, but found nothing - just trying to change Calender class and use new Date() and getting the same result

I also tried to clean the project, check the emulator date setting, the phone setting bu couldn't fix the bug.

any help?

Answer 1

mm stays for minutes in the hour. What you need is MM, months in a year.

 startDate.setText(new SimpleDateFormat("MM/dd/yy",Locale.getDefault()).format(Calendar.getInstance().getTime()).toString());

you can read more about the pattern here

Answer 2

you should use MM (Months) instead of mm(Minute in hour)

MM   -->10
MMM  -->Nov
MMMM -->November

sample code

 startDate.setText(new SimpleDateFormat("MM/dd/yy",Locale.getDefault()).format(Calendar.getInstance().getTime()).toString());

Answer 3

In SimpleDateFormat "m" stands for "minute in hour".

If you want to get the month then use following pattern "MM/dd/yyyy".

Also, make sure if you want to use "yyyy" or "YYYY"

Check this

Answer 4

其他答案是正确的格式模式不正确。

更好的是，放弃麻烦的旧日期时间课程。这些现在被java.time类取代。

考虑时区对于确定当前日期至关重要。对于任何给定的时刻，日期因地区而异。例如，Pacific/Auckland中的新日期早于America/Montreal。

ZoneId z = `America/Los_Angeles` ;
LocalDate today = LocalDate.now( z ) ;

让java.time自动本地化为您想要的格式。

DateTimeFormatter f = DateTimeFormatter.ofLocalizedDate( FormatStyle.SHORT ).withLocale( Locale.US ) ;
String output = today.format( f ) ;

对于Java 6＆amp; 7，参见ThreeTen-Backport项目。对于较旧的Android，请参阅ThreeTenABP项目。

如有必要，可以通过调用添加到Java 8或更高版本中的旧类的新方法来在旧类和现代类之间进行转换。如果使用后端口，请参阅其实用程序类。