Returns a Date set to the first possible millisecond of the month, just after midnight. : Date Calculation « Data Type « Java






Returns a Date set to the first possible millisecond of the month, just after midnight.

     
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import java.util.Calendar;
import java.util.Date;

public class Utils {
  /**
   * Returns a Date set to the first possible millisecond of the month, just
   * after midnight. If a null day is passed in, a new Date is created.
   * midnight (00m 00h 00s)
   */
  public static Date getStartOfMonth(Date day) {
      return getStartOfMonth(day, Calendar.getInstance());
  }
  
  
  public static Date getStartOfMonth(Date day, Calendar cal) {
      if (day == null) day = new Date();
      cal.setTime(day);
      
      // set time to start of day
      cal.set(Calendar.HOUR_OF_DAY, cal.getMinimum(Calendar.HOUR_OF_DAY));
      cal.set(Calendar.MINUTE,      cal.getMinimum(Calendar.MINUTE));
      cal.set(Calendar.SECOND,      cal.getMinimum(Calendar.SECOND));
      cal.set(Calendar.MILLISECOND, cal.getMinimum(Calendar.MILLISECOND));
      
      // set time to first day of month
      cal.set(Calendar.DAY_OF_MONTH, 1);
      
      return cal.getTime();
  }
}

   
    
    
    
    
  








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