Roll the java.util.Date forward or backward : Date Calculation « Data Type « Java

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Java » Data Type » Date CalculationScreenshots 
Roll the java.util.Date forward or backward
   
/*
 * Copyright Javelin Software, All rights reserved.
 */


import java.util.*;
import java.text.*;

/**
 * The DateUtil is used as a Utility Class for Dates.
 
 @author Robin Sharp
 */

public class DateUtil 
{
    public final static long SECOND_MILLIS = 1000;
    public final static long MINUTE_MILLIS = SECOND_MILLIS*60;
    public final static long HOUR_MILLIS = MINUTE_MILLIS*60;
    public final static long DAY_MILLIS = HOUR_MILLIS*24;
    public final static long YEAR_MILLIS = DAY_MILLIS*365;

    public static DateFormat OUT_DATE_FORMAT = new SimpleDateFormat("dd/MM/yyyy");
    public static DateFormat OUT_TIME_FORMAT = new SimpleDateFormat("H:mm:ss");
    public static DateFormat OUT_DATETIME_FORMAT = new SimpleDateFormat("d/M/yyyy H:mm:ss");
    public static DateFormat OUT_TIMESTAMP_FORMAT = new SimpleDateFormat("d/M/yy H:mm:ss.SSS");
    
    public static DateFormat IN_DATE_FORMAT = new SimpleDateFormat("d/M/yy");
    public static DateFormat IN_TIME_FORMAT = new SimpleDateFormat("H:mm:ss");
    public static DateFormat IN_DATETIME_FORMAT = new SimpleDateFormat("d/M/yy H:mm:ss");
    public static DateFormat IN_TIMESTAMP_FORMAT = new SimpleDateFormat("d/M/yy H:mm:ss.SSS");
    
    public static DateFormat DATE_TIME_FORMAT= new SimpleDateFormat"yyyyMMddkkmmss" );  

    public static Calendar calendar = new GregorianCalendar();

    static
    {
        IN_DATE_FORMAT.setLenient(false);
        IN_TIME_FORMAT.setLenient(false);
        IN_DATETIME_FORMAT.setLenient(false);
    }

    /**
     * Create a new DateTime. To the last second. This will not create any 
     * extra-millis-seconds, which may cause bugs when writing to stores such as
     * databases that round milli-seconds up and down. 
     */
    public static java.util.Date newDateTime()
    {
        return new java.util.Date( (System.currentTimeMillis()/SECOND_MILLIS)*SECOND_MILLIS);
    }

    /**
     * Create a new Date. To the last day.
     */
    public static java.sql.Date newDate()
    {
        return new java.sql.Date( (System.currentTimeMillis()/DAY_MILLIS)*DAY_MILLIS);
    }
    
    /**
     * Create a new Time, with no date component. 
     */
    public static java.sql.Time newTime()
    {
        return new java.sql.TimeSystem.currentTimeMillis()%DAY_MILLIS);
    }
    
    /**
     * Create a new Timestamp. 
     */
    public static java.sql.Timestamp newTimestamp()
    {
        return new java.sql.TimestampSystem.currentTimeMillis() );
    }
    
    /**
     * Get the seconds difference
     */
    public static int secondsDiffDate earlierDate, Date laterDate )
    {
        ifearlierDate == null || laterDate == null return 0;
        
        return (int)((laterDate.getTime()/SECOND_MILLIS(earlierDate.getTime()/SECOND_MILLIS));
    }

    /**
     * Get the minutes difference
     */
    public static int minutesDiffDate earlierDate, Date laterDate )
    {
        ifearlierDate == null || laterDate == null return 0;
        
        return (int)((laterDate.getTime()/MINUTE_MILLIS(earlierDate.getTime()/MINUTE_MILLIS));
    }
    
    /**
     * Get the hours difference
     */
    public static int hoursDiffDate earlierDate, Date laterDate )
    {
        ifearlierDate == null || laterDate == null return 0;
        
        return (int)((laterDate.getTime()/HOUR_MILLIS(earlierDate.getTime()/HOUR_MILLIS));
    }
    
    /**
     * Get the days difference
     */
    public static int daysDiffDate earlierDate, Date laterDate )
    {
        ifearlierDate == null || laterDate == null return 0;
        
        return (int)((laterDate.getTime()/DAY_MILLIS(earlierDate.getTime()/DAY_MILLIS));
    }

    
   /**
    * Roll the java.util.Time forward or backward.
    @param startDate - The start date
    * @period Calendar.YEAR etc
    @param amount - Negative to rollbackwards.
    */
    public static java.sql.Time rollTimejava.util.Date startDate, int period, int amount )
    {
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(startDate);
        gc.add(period, amount);
        return new java.sql.Time(gc.getTime().getTime());
    }
    
   /**
    * Roll the java.util.Date forward or backward.
    @param startDate - The start date
    * @period Calendar.YEAR etc
    @param amount - Negative to rollbackwards.
    */
    public static java.util.Date rollDateTimejava.util.Date startDate, int period, int amount )
    {
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(startDate);
        gc.add(period, amount);
        return new java.util.Date(gc.getTime().getTime());
    }
    
   /**
    * Roll the java.sql.Date forward or backward.
    @param startDate - The start date
    * @period Calendar.YEAR etc
    @param amount - Negative to rollbackwards.
    */
    public static java.sql.Date rollDatejava.util.Date startDate, int period, int amount )
    {
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(startDate);
        gc.add(period, amount);
        return new java.sql.Date(gc.getTime().getTime());
    }
    
   /**
    * Roll the years forward or backward.
    @param startDate - The start date
    @param years - Negative to rollbackwards.
    */
    public static java.sql.Date rollYearsjava.util.Date startDate, int years )
    {
        return rollDatestartDate, Calendar.YEAR, years );
    }

   /**
    * Roll the days forward or backward.
    @param startDate - The start date
    @param months - Negative to rollbackwards.
    */
    public static java.sql.Date rollMonthsjava.util.Date startDate, int months )
    {
        return rollDatestartDate, Calendar.MONTH, months );
    }

   /**
    * Roll the days forward or backward.
    @param startDate - The start date
    @param days - Negative to rollbackwards.
    */
    public static java.sql.Date rollDaysjava.util.Date startDate, int days )
    {
        return rollDatestartDate, Calendar.DATE, days );
    }
    
     /**
      * Checks the day, month and year are equal.
      */
     public static boolean dateEqualsjava.util.Date d1, java.util.Date d2 )
     {
        ifd1 == null || d2 == null return false;
        
        return d1.getDate() == d2.getDate() &&
               d1.getMonth() == d2.getMonth() &&
               d1.getYear() == d2.getYear();
     }
     
     /**
      * Checks the hour, minute and second are equal.
      */
     public static boolean timeEqualsjava.util.Date d1, java.util.Date d2 )
     {
        ifd1 == null || d2 == null return false;
        
        return d1.getHours() == d2.getHours() &&
               d1.getMinutes() == d2.getMinutes() &&
               d1.getSeconds() == d2.getSeconds();
     }


    /**
      * Checks the second, hour, month, day, month and year are equal.
      */
     public static boolean dateTimeEqualsjava.util.Date d1, java.util.Date d2 )
     {
        ifd1 == null || d2 == null return false;               
        
        return d1.getDate() == d2.getDate() &&
               d1.getMonth() == d2.getMonth() &&
               d1.getYear() == d2.getYear() &&
               d1.getHours() == d2.getHours() &&
               d1.getMinutes() == d2.getMinutes() &&
               d1.getSeconds() == d2.getSeconds();
     }
     
     /**
     * Convert an Object of type Classs to an Object.
     */
    public static Object toObjectClass clazz, Object value throws ParseException
    {
        ifvalue == null return null;
        ifclazz == null return value;
        
        ifjava.sql.Date.class.isAssignableFromclazz ) ) return toDatevalue );
        ifjava.sql.Time.class.isAssignableFromclazz ) ) return toTimevalue );
        ifjava.sql.Timestamp.class.isAssignableFromclazz ) ) return toTimestampvalue );
        ifjava.util.Date.class.isAssignableFromclazz ) ) return toDateTimevalue );
        
        return value;
    }
    
    /**
     * Convert an Object to a DateTime, without an Exception
     */
    public static java.util.Date getDateTimeObject value )
    {
        try
        {
            return toDateTimevalue );
        }
        catchParseException pe )
        {
            pe.printStackTrace();
            return null;
        }
    }
    
    /**
     * Convert an Object to a DateTime.
     */
    public static java.util.Date toDateTimeObject value throws ParseException
    {
        ifvalue == null return null;        
        ifvalue instanceof java.util.Date return (java.util.Date)value;
        ifvalue instanceof String )
        {
            if"".equals( (String)value ) ) return null;
            return IN_DATETIME_FORMAT.parse( (String)value );
        }
                
        return IN_DATETIME_FORMAT.parsevalue.toString() );
    }
    
    /**
     * Convert an Object to a Date, without an Exception
     */
    public static java.sql.Date getDateObject value )
    {
        try
        {
            return toDatevalue );
        }
        catchParseException pe )
        {
            pe.printStackTrace();
            return null;
        }
    }

    /**
     * Convert an Object to a Date.
     */
    public static java.sql.Date toDateObject value throws ParseException
    {
        ifvalue == null return null;        
        ifvalue instanceof java.sql.Date return (java.sql.Date)value;
        ifvalue instanceof String )
        {
            if"".equals( (String)value ) ) return null;
            return new java.sql.DateIN_DATE_FORMAT.parse( (String)value ).getTime() );
        }
                
        return new java.sql.DateIN_DATE_FORMAT.parsevalue.toString() ).getTime() );
    }
    
    /**
     * Convert an Object to a Time, without an Exception
     */
    public static java.sql.Time getTimeObject value )
    {
        try
        {
            return toTimevalue );
        }
        catchParseException pe )
        {
            pe.printStackTrace();
            return null;
        }
    }
    
    /**
     * Convert an Object to a Time.
     */
    public static java.sql.Time toTimeObject value throws ParseException
    {
        ifvalue == null return null;        
        ifvalue instanceof java.sql.Time return (java.sql.Time)value;
        ifvalue instanceof String )
        {
            if"".equals( (String)value ) ) return null;
            return new java.sql.TimeIN_TIME_FORMAT.parse( (String)value ).getTime() );
        }
                
        return new java.sql.TimeIN_TIME_FORMAT.parsevalue.toString() ).getTime() );
    }
    
    /**
     * Convert an Object to a Timestamp, without an Exception
     */
    public static java.sql.Timestamp getTimestampObject value )
    {
        try
        {
            return toTimestampvalue );
        }
        catchParseException pe )
        {
            pe.printStackTrace();
            return null;
        }
    }

    /**
     * Convert an Object to a Timestamp.
     */
    public static java.sql.Timestamp toTimestampObject value throws ParseException
    {
        ifvalue == null return null;        
        ifvalue instanceof java.sql.Timestamp return (java.sql.Timestamp)value;
        ifvalue instanceof String )
        {
            if"".equals( (String)value ) ) return null;
            return new java.sql.TimestampIN_TIMESTAMP_FORMAT.parse( (String)value ).getTime() );
        }
                
        return new java.sql.TimestampIN_TIMESTAMP_FORMAT.parsevalue.toString() ).getTime() );
    }
    
    /**
     * Tells you if the date part of a datetime is in a certain time range.
     */
    public static boolean isTimeInRangejava.sql.Time start, java.sql.Time end, java.util.Date d )
    {
        d=new java.sql.Time(d.getHours(),d.getMinutes(),d.getSeconds());
        
        if (start==null || end==null)
        {
            return false;
        }
        
        if (start.before(end)&&(!(d.after(start)&&d.before(end))))
        {
            return false;
        }
        
        if (end.before(start)&&(!(d.after(end)||d.before(start))))
        {
            return false;
        }   
        return true;
    }

    public static  int getYearDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.YEAR );
    }

    public static int getMonthDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.MONTH );
    }

    public static int getDateDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.DATE );
    }

    public static int getHourDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.HOUR );
    }

    public static int getMinuteDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.MINUTE );
    }

    public static int getSecondsDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.SECOND );
    }

    public static int getMillisecondDate date )
    {
        calendar.setTimedate );
        return calendar.getCalendar.MILLISECOND );
    }
    
    /**
     * Convert an Object to a String using Dates
     */
    public static String toStringObject date )
    {
        ifdate == null return null;
        
        ifjava.sql.Timestamp.class.isAssignableFromdate.getClass() ) )
        {
            return OUT_TIMESTAMP_FORMAT.formatdate );
        }
        ifjava.sql.Time.class.isAssignableFromdate.getClass() ) )
        {
            return OUT_TIME_FORMAT.formatdate );
        }
        ifjava.sql.Date.class.isAssignableFromdate.getClass() ) )
        {
            return OUT_DATE_FORMAT.formatdate );
        }
        ifjava.util.Date.class.isAssignableFromdate.getClass() ) )
        {
            return OUT_DATETIME_FORMAT.formatdate );
        }
        
        throw new IllegalArgumentException"Unsupported type " + date.getClass() );
    }

}

   
    
    
  
Related examples in the same category
1. Get the days difference
2. Get the days passed from the specified date up to the date provided in the constructor
3. Get the hours difference
4. Get the minutes difference
5. Get the seconds difference
6. Adds a number of days to a date returning a new object.
7. Adds a number of hours to a date returning a new object.
8. Adds a number of milliseconds to a date returning a new object.
9. Adds a number of minutes to a date returning a new object.
10. Adds a number of months to a date returning a new object.
11. Adds a number of seconds to a date returning a new object.
12. Adds a number of weeks to a date returning a new object.
13. Adds a number of years to a date returning a new object.
14. Returns a Date set just to Noon, to the closest possible millisecond of the day.
15. Returns a Date set to the first possible millisecond of the day, just after midnight.
16. Returns a Date set to the first possible millisecond of the month, just after midnight.
17. Returns a Date set to the last possible millisecond of the day, just before midnight.
18. Returns a Date set to the last possible millisecond of the minute.
19. Returns a Date set to the last possible millisecond of the month, just before midnight.
20. Returns a java.sql.Timestamp equal to the current time
21. Returns the number of days within the fragment.
22. Returns the number of hours within the fragment.
23. Returns the number of milliseconds within the fragment.
24. Returns the number of minutes within the fragment.
25. Returns the number of seconds within the fragment.
26. Returns true if endDate is after startDate or if startDate equals endDate.
27. Roll the days forward or backward
28. Roll the java.sql.Date forward or backward
29. Roll the java.util.Time forward or backward
30. Roll the years forward or backward
31. Round this date, leaving the field specified as the most significant field.
32. Checking date as String formatted by a date format
33. Checks if a calendar date is after today and within a number of days in the future
34. Checks if a calendar date is today
35. Checks if a date is after today and within a number of days in the future
36. Checks if the first calendar date is after the second calendar date ignoring time
37. Checks if the first calendar date is before the second calendar date ignoring time
38. Checks if the first date is after the second date ignoring time
39. Checks if the first date is before the second date ignoring time
40. Checks if two calendars represent the same day ignoring time
41. Checks if two dates are on the same day ignoring time
42. Checks the day, month and year are equal
43. Checks the hour, minute and second are equal
44. Make the date go forward of the specified amount of minutes
45. Make the date go back of the specified amount of days
46. Returns the maximum of two dates. A null date is treated as being less than any non-null date
47. Utilities to working with dates java.util.Date
48. Calculate Holidays
49. Compare two dates
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