DayOfWeek from() method in Java with Examples

The from() method of java.time.DayOfWeek is an in-built function in Java which takes a TemporalAccessor defining a date and returns an instance of DayOfWeek corresponding to that date. A TemporalAccessor represents an arbitrary set of date and time information, which this method converts to an instance of DayOfWeek corresponding to that date.

Method Declaration:

 public static DayOfWeek from(TemporalAccessor temporal)

Syntax:



 DayOfWeek dayOfWeekObject = DayOfWeek.from(TemporalAccessor temporal)

Parameters: This method takes temporal as parameter where:

  • temporal – is a TemporalAccessor which represents a date.
  • dayOfWeekObject – is an instance of DayOfWeek.
  • Return Value: The function returns an instance of DayOfWeek corresponding to the date specified by temporal

    Below programs illustrate the above method:
    Program 1:

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    // Java Program Demonstrate from()
    // method of DayOfWeek
      
    import java.time.*;
    import java.time.DayOfWeek;
      
    class DayOfWeekExample {
        public static void main(String[] args)
        {
            // Set a local date whose day is found
            LocalDate localDate
                = LocalDate.of(1997, Month.AUGUST, 15);
      
            // Initialize a DayOfWeek object
            // with specified local Date
            DayOfWeek dayOfWeek
                = DayOfWeek.from(localDate);
      
            // Printing the day of the week
            System.out.println("Day of the Week on "
                               + localDate + " - "
                               + dayOfWeek.name());
        }
    }

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    Output:

    Day of the Week on 1997-08-15 - FRIDAY
    

    Program 2:

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    // Java Program Demonstrate from()
    // method of DayOfWeek
      
    import java.time.*;
      
    class DayOfWeekExample {
        public static void main(String[] args)
        {
            // Set a local date whose day is found
            LocalDate localDate
                = LocalDate.of(2015, Month.JULY, 13);
      
            // Initialize a DayOfWeek object
            // with specified local Date
            DayOfWeek dayOfWeek
                = DayOfWeek.from(localDate);
      
            // Printing the day of the week
            System.out.println("Day of the Week on "
                               + localDate + " - "
                               + dayOfWeek.name());
        }
    }

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    Output:

    Day of the Week on 2015-07-13 - MONDAY
    

    Reference: https://docs.oracle.com/javase/8/docs/api/java/time/DayOfWeek.html#from-java.time.temporal.TemporalAccessor-



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