SimpleDateFormat을 사용하여 문자열을 날짜로 변환하는 방법은 무엇입니까?

SimpleDateFormat을 사용하여 문자열을 날짜로 변환하는 방법은 무엇입니까?

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이 코드 스 니펫이 있습니다.

DateFormat formatter1;
formatter1 = new SimpleDateFormat("mm/DD/yyyy");
System.out.println((Date)formatter1.parse("08/16/2011"));

이것을 실행하면 다음과 같이 출력됩니다.

Sun Jan 16 00:10:00 IST 2011

기대했다:

Tue Aug 16 "Whatever Time" IST 2011

나는 내가 예상 한 달을 얻지 못한다고 말하고 싶다. 실수는 무엇입니까?

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이 시도:

new SimpleDateFormat("MM/dd/yyyy")

• MM"month"(아님 mm)
• dd"일"(아님 DD)

SimpleDateFormat에 대한 모든 것은 javadoc에 있습니다.

참고로, 형식이 여전히 유효한 날짜 형식 인 이유는 다음과 같습니다.

• mm "분"입니다
• DD "연중 하루"입니다.

에 또한, 당신은 캐스트가 필요하지 않습니다 Date이미 ... 이다 a가 Date(또는 폭발) :

public static void main(String[] args) throws ParseException {
    System.out.println(new SimpleDateFormat("MM/dd/yyyy").parse("08/16/2011"));
}

산출:

Tue Aug 16 00:00:00 EST 2011

짜잔!

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m-min M-개월

Letter  Date or Time Component  Presentation    Examples
G       Era designator          Text                AD
y       Year                    Year                1996; 96
M       Month in year           Month               July; Jul; 07
w       Week in year            Number              27
W       Week in month           Number              2
D       Day in year             Number              189
d       Day in month            Number              10
F       Day of week in month    Number              2
E       Day in week             Text                Tuesday; Tue
a       Am/pm marker            Text                PM
H       Hour in day (0-23)      Number              0
k       Hour in day (1-24)      Number              24
K       Hour in am/pm (0-11)    Number              0
h       Hour in am/pm (1-12)    Number              12
m       Minute in hour          Number              30
s       Second in minute        Number              55
S       Millisecond             Number              978
z       Time zone               General time zone   Pacific Standard Time; PST; GMT-08:00
Z       Time zone               RFC 822 time zone   -0800 

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아래 기능 사용

/**
     * Format a time from a given format to given target format
     * 
     * @param inputFormat
     * @param inputTimeStamp
     * @param outputFormat
     * @return
     * @throws ParseException
     */
    private static String TimeStampConverter(final String inputFormat,
            String inputTimeStamp, final String outputFormat)
            throws ParseException {
        return new SimpleDateFormat(outputFormat).format(new SimpleDateFormat(
                inputFormat).parse(inputTimeStamp));
    }

샘플 사용법은 다음과 같습니다.

    try {
        String inputTimeStamp = "08/16/2011";

        final String inputFormat = "MM/dd/yyyy";
        final String outputFormat = "EEE MMM dd HH:mm:ss z yyyy";

        System.out.println(TimeStampConverter(inputFormat, inputTimeStamp,
                outputFormat));

    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

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String newstr = "08/16/2011";
SimpleDateFormat format1 = new SimpleDateFormat("MM/dd/yyyy");
SimpleDateFormat format = new SimpleDateFormat("EE MMM dd hh:mm:ss z yyyy");
Calendar c = Calendar.getInstance();
c.setTime(format1.parse(newstr));
System.out.println(format.format(c.getTime()));

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아주 간단한 예입니다.

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy");
                Date date = new Date();
                Date date1 = new Date();
            try {
                System.out.println("Date1:   "+date1);
                System.out.println("date" + date);

                date = simpleDateFormat.parse("01-01-2013");
                date1 = simpleDateFormat.parse("06-15-2013");

                System.out.println("Date1 is:"+date1);
                System.out.println("date" + date);

            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

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이 코드 조각은 앞뒤로 변환하는 데 도움이됩니다.

    System.out.println("Date: "+ String.valueOf(new Date()));
    SimpleDateFormat dt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String stringdate = dt.format(new Date());
    System.out.println("String.valueOf(date): "+stringdate);

    try {
    Date date = dt.parse(stringdate);
    System.out.println("parse date: "+ String.valueOf(date));
    } catch (ParseException e) {
    e.printStackTrace();
    }

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you can solve the problem much simple like First convert the the given string to the date object eg:

java.util.Date date1 = new Date("11/19/2015"); 
SimpleDateFormat formatter = new SimpleDateFormat("MMM dd yyyy HH:mma");
String format = formatter.format(date);
System.out.println(format);

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    DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("MM/dd/uuuu");
    System.out.println(LocalDate.parse("08/16/2011", dateFormatter));

Output:

2011-08-16

I am contributing the modern answer. The answer by Bohemian is correct and was a good answer when it was written 6 years ago. Now the notoriously troublesome SimpleDateFormat class is long outdated and we have so much better in java.time, the modern Java date and time API. I warmly recommend you use this instead of the old date-time classes.

What went wrong in your code?

When I parse 08/16/2011 using your snippet, I get Sun Jan 16 00:08:00 CET 2011. Since lowercase mm is for minutes, I get 00:08:00 (8 minutes past midnight), and since uppercase DD is for day of year, I get 16 January.

In java.time too format pattern strings are case sensitive, and we needed to use uppercase MM for month and lowercase dd for day of month.

Question: Can I use java.time with my Java version?

Yes, java.time works nicely on Java 6 and later and on both older and newer Android devices.

• In Java 8 and later and on new Android devices (from API level 26, I’m told) the modern API comes built-in.
• In Java 6 and 7 get the ThreeTen Backport, the backport of the new classes (ThreeTen for JSR 310; see the links at the bottom).
• On (older) Android use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

• Oracle tutorial: Date Time explaining how to use java.time.
• Java Specification Request (JSR) 310, where java.time was first described.
• ThreeTen Backport project, the backport of java.timeto Java 6 and 7 (ThreeTen for JSR-310).
• ThreeTenABP, Android edition of ThreeTen Backport
• Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.

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String localFormat = android.text.format.DateFormat.getBestDateTimePattern(Locale.getDefault(), "EEEE MMMM d");
return new SimpleDateFormat(localFormat, Locale.getDefault()).format(localMidnight);

will return a format based on device's language. Note that getBestDateTimePattern() returns "the best possible localized form of the given skeleton for the given locale"

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You have used some type errors. If you want to set 08/16/2011 to following pattern. It is wrong because,

mm stands for minutes, use MM as it is for Months

DD is wrong, it should be dd which represents Days

Try this to achieve the output you want to get ( Tue Aug 16 "Whatever Time" IST 2011 ),

    String date = "08/16/2011"; //input date as String

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM/dd/yyyy"); // date pattern

    Date myDate = simpleDateFormat.parse(date); // returns date object 

    System.out.println(myDate); //outputs: Tue Aug 16 00:00:00 IST 2011

참고URL : https://stackoverflow.com/questions/9872419/how-to-convert-a-string-to-a-date-using-simpledateformat