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javadatetimedayofweekdatetime-parsing
Veljko
Veljko

Reputation: 1808

How to get DAY of the WEEK from the datetime format in JAVA?

I have date time information in this format:

String reportDate="2012-04-19 12:32:24";

I want to have as output day of the week (Thursday or 4 as result anyway is good). How to achieve this?

Thanks

Upvotes: 2

Views: 1487

Answers (5)

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 78995

java.time

In March 2014, Java 8 introduced the modern, java.time date-time API which supplanted the error-prone legacy, java.util date-time API.

Parse the given date-time string into LocalDateTime instances by using a DateTimeFormatter with the corresponding pattern. Then, get the desired values from the resulting LocalDateTime object.

Demo:

public class Main {
    public static void main(String[] args) {
        String reportDate = "2012-04-19 12:32:24";
        DateTimeFormatter parsingPattern = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss", Locale.ENGLISH);
        LocalDateTime ldt = LocalDateTime.parse(reportDate, parsingPattern);
        System.out.println(ldt.getDayOfWeek()); // THURSDAY
        System.out.println(ldt.getDayOfWeek().getValue()); // 4

        // Get the textual representation of the enum constant
        System.out.println(ldt.getDayOfWeek()
                .getDisplayName(TextStyle.FULL, Locale.ENGLISH));
        System.out.println(ldt.getDayOfWeek()
                .getDisplayName(TextStyle.FULL, Locale.forLanguageTag("hi-IN"))); // Hindi
        System.out.println(ldt.getDayOfWeek()
                .getDisplayName(TextStyle.FULL, Locale.forLanguageTag("bn-BD"))); // Bangla
        // Alternatively,
        System.out.println(ldt.format(DateTimeFormatter.ofPattern("EEEE", Locale.ENGLISH)));
    }
}

Output:

THURSDAY
4
Thursday
गुरुवार
বৃহস্পতিবার
Thursday

Online Demo

Note that DayOfWeek#THURSDAY is an enum constant and you can get the textual representation using DayOfWeek#getDisplayName.

Learn more about the modern Date-Time API from Trail: Date Time.

Upvotes: 2

namalfernandolk
namalfernandolk

Reputation: 9134

Try,

System.out.println(new SimpleDateFormat("E").format(new SimpleDateFormat("yyyy-MM-dd").parse(reportDate)));
System.out.println(new SimpleDateFormat("F").format(new SimpleDateFormat("yyyy-MM-dd").parse(reportDate)));

Upvotes: -1

user684934
user684934

Reputation:

Use the Calendar after parsing the string:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:SS");
Date d = sdf.parse(reportDate);
Calendar cal = Calendar.getInstance();
cal.setTime(d);
return cal.get(Calendar.DAY_OF_WEEK);

Upvotes: 5

tbraun89
tbraun89

Reputation: 2234

Use the SimpleDateFormat to parse the String then you have a Date object an can get the day of the week.

Upvotes: 1

npinti
npinti

Reputation: 52185

Parse your date to an actual Date Object and then pass it to a Calendar Instance (through setTime(Date date)). You can then use the DAY_OF_WEEK to get a number representing the days of the week.

Upvotes: 0

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