如何在Java中将日历设置为特定日期和时间

Question

I am using Calender class of java ..Here calender has been set for day of week and time .Now as per my need i want to set it for date of month and time like calender should be set for 10th of month and time time should be 10 am.But i am not able to get it ..

Here is my code..

Calendar date = Calendar.getInstance();
    date.set(
            Calendar.DAY_OF_WEEK,
            Calendar.TUESDAY);
    date.set(Calendar.HOUR, 10);
    date.set(Calendar.MINUTE, 58);
    date.set(Calendar.SECOND, 0);
    date.set(Calendar.MILLISECOND, 0);

Please help me.. Thanks in advance..

Answer 1

If you want set the date of the month, then you could use either of the two, interchangeably.

date.set(Calendar.DAY_OF_MONTH, 10); // Synonym of DATE
date.set(Calendar.DATE, 10); // Synonym of DAY_OF_MONTH

Answer 2

Your code works, only difference is your setting day. but which week of the day?

below code to demonstrate to to set date and time to calender.

Calendar date = Calendar.getInstance();
    long today = date.getTimeInMillis();
    date.set(
            Calendar.DATE,11);
    date.set(Calendar.HOUR, 10);
    date.set(Calendar.MINUTE, 58);
    date.set(Calendar.SECOND, 0);
    date.set(Calendar.MILLISECOND, 0);
    date.set(Calendar.MONTH, 10);
    date.set(Calendar.YEAR, 2013);
    date.setTimeZone(TimeZone.getDefault());

    long lastday = date.getTimeInMillis();
    System.out.println(date.getTimeInMillis());

    long diff = today - lastday;
    diff = ((diff/1000)/360);
    System.out.println("Hours diff :"+diff);

Answer 3

tl;dr

ZonedDateTime.of( 2016 , 9 , 10 , 10 , 0 , 0 , 0 , ZoneId.of( "Europe/Paris" ) )

Details

The accepted answer by Ɍ.Ɉ is correct.

java.time

Here is the way to do the same but with modern java.time classes that supplant the troublesome old legacy date-time classes.

The http://docs.oracle.com/javase/8/docs/api/java/time/ZonedDateTime.html class represents a moment on the timeline in a particular time zone with a resolution of nanoseconds . Instantiate with all the specific year, month, hour, etc. arguments: of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond, ZoneId zone) .

ZoneId z = ZoneId.of( "Europe/Paris" );
ZonedDateTime zdt = ZonedDateTime.of( 2016 , 9 , 10 , 10 , 0 , 0 , 0 , z );

See a String representation of that value in standard ISO 8601 format extended by appending name of time zone in square brackets.

String output = zdt.toString();

2016-09-10T10:00:00+02:00[Europe/Paris]

If you want Strings generated in other formats, search Stack Overflow for DateTimeFormatter .

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the old troublesome date-time classes such as java.util.Date , .Calendar , & java.text.SimpleDateFormat .

The Joda-Time project, now in maintenance mode , advises migration to java.time.

To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations.

Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP (see How to use… ).

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval , YearWeek , YearQuarter , and more.