org.dstadler.commons.date

Class DayCalendar

java.lang.Object

java.util.Calendar

java.util.GregorianCalendar

org.dstadler.commons.date.DayCalendar

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Comparable<java.util.Calendar>

public class DayCalendar
extends java.util.GregorianCalendar

Taken from http://www.xmission.com/~goodhill/dates/deltaDates.html Demonstration of delta day calculations.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.Calendar

java.util.Calendar.Builder

Field Summary

Fields

Modifier and Type	Field and Description
static long	EPOCH_UNIX_ERA_DAY Value to add to the day number returned by this calendar to find the Julian Day number.
protected static long	MILLISECS_PER_DAY Number of leap seconds per day expect on 1. days when a leap second has been inserted, e.g. 1999 JAN 1. 2.
static long	MILLISECS_PER_HOUR Number of milliseconds per hour, except when a leap second is inserted.
static long	MILLISECS_PER_MINUTE All minutes have this many milliseconds except the last minute of the day on a day defined with a leap second.

Fields inherited from class java.util.GregorianCalendar

AD, BC

Fields inherited from class java.util.Calendar

ALL_STYLES, AM, AM_PM, APRIL, areFieldsSet, AUGUST, DATE, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_WEEK_IN_MONTH, DAY_OF_YEAR, DECEMBER, DST_OFFSET, ERA, FEBRUARY, FIELD_COUNT, fields, FRIDAY, HOUR, HOUR_OF_DAY, isSet, isTimeSet, JANUARY, JULY, JUNE, LONG, LONG_FORMAT, LONG_STANDALONE, MARCH, MAY, MILLISECOND, MINUTE, MONDAY, MONTH, NARROW_FORMAT, NARROW_STANDALONE, NOVEMBER, OCTOBER, PM, SATURDAY, SECOND, SEPTEMBER, SHORT, SHORT_FORMAT, SHORT_STANDALONE, SUNDAY, THURSDAY, time, TUESDAY, UNDECIMBER, WEDNESDAY, WEEK_OF_MONTH, WEEK_OF_YEAR, YEAR, ZONE_OFFSET

Constructor Summary

Constructors

Constructor and Description
DayCalendar()
DayCalendar(int y, int m, int d)
DayCalendar(int y, int m, int d, int h, int min, int s)
DayCalendar(long millisecondTime)

Method Summary

Modifier and Type	Method and Description
long	diffDayPeriods(java.util.Calendar end) find the number of days from this date to the given end date.
long	getJulianDay()
long	getUnixDay()

Methods inherited from class java.util.GregorianCalendar

add, clone, computeFields, computeTime, equals, from, getActualMaximum, getActualMinimum, getCalendarType, getGreatestMinimum, getGregorianChange, getLeastMaximum, getMaximum, getMinimum, getTimeZone, getWeeksInWeekYear, getWeekYear, hashCode, isLeapYear, isWeekDateSupported, roll, roll, setGregorianChange, setTimeZone, setWeekDate, toZonedDateTime

Methods inherited from class java.util.Calendar

after, before, clear, clear, compareTo, complete, get, getAvailableCalendarTypes, getAvailableLocales, getDisplayName, getDisplayNames, getFirstDayOfWeek, getInstance, getInstance, getInstance, getInstance, getMinimalDaysInFirstWeek, getTime, getTimeInMillis, internalGet, isLenient, isSet, set, set, set, set, setFirstDayOfWeek, setLenient, setMinimalDaysInFirstWeek, setTime, setTimeInMillis, toInstant, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

MILLISECS_PER_MINUTE

public static final long MILLISECS_PER_MINUTE

All minutes have this many milliseconds except the last minute of the day on a day defined with a leap second.

See Also:

Constant Field Values

MILLISECS_PER_HOUR

public static final long MILLISECS_PER_HOUR

Number of milliseconds per hour, except when a leap second is inserted.

See Also:

Constant Field Values

MILLISECS_PER_DAY

protected static final long MILLISECS_PER_DAY

Number of leap seconds per day expect on 1. days when a leap second has been inserted, e.g. 1999 JAN 1. 2. Daylight-savings "spring forward" or "fall back" days.

See Also:

Constant Field Values

EPOCH_UNIX_ERA_DAY

public static final long EPOCH_UNIX_ERA_DAY

Value to add to the day number returned by this calendar to find the Julian Day number. This is the Julian Day number for 1/1/1970. Note: Since the unix Day number is the same from local midnight to local midnight adding JULIAN_DAY_OFFSET to that value results in the chronologist, historians, or calenderists Julian Day number.

See Also:

here, Constant Field Values

Constructor Detail

DayCalendar

public DayCalendar()

See Also:

GregorianCalendar.GregorianCalendar()

DayCalendar

public DayCalendar(long millisecondTime)

Parameters:

millisecondTime - - time as a binary Unix/Java time value.

See Also:

GregorianCalendar

DayCalendar

public DayCalendar(int y,
                   int m,
                   int d)

See Also:

GregorianCalendar.GregorianCalendar(int, int, int)

DayCalendar

public DayCalendar(int y,
                   int m,
                   int d,
                   int h,
                   int min,
                   int s)

See Also:

GregorianCalendar.GregorianCalendar(int, int, int, int, int, int)

Method Detail

getUnixDay

public long getUnixDay()

Returns:

Day number where day 0 is 1/1/1970, as per the Unix/Java date/time epoch.

getJulianDay

public long getJulianDay()

Returns:

LOCAL Chronologists Julian day number each day starting from midnight LOCAL TIME. See here for more information about local C-JDN

diffDayPeriods

public long diffDayPeriods(java.util.Calendar end)

find the number of days from this date to the given end date. later end dates result in positive values. Note this is not the same as subtracting day numbers. Just after midnight subtracted from just before midnight is 0 days for this method while subtracting day numbers would yields 1 day.

Parameters:

end - - any Calendar representing the moment of time at the end of the interval for calculation.

Returns:

The difference in days