com.antelmann.calendar
Class CalendarUtils

java.lang.Object
  com.antelmann.calendar.CalendarUtils

public final class CalendarUtils
extends Object

methods that require a calendar for calculation are synchronized, so they do not perform simultaneously

Author:

Holger Antelmann

Field Summary

static SimpleDateFormat

ietfDateFormat the IETF date format is used in HTTP headers for displaying the date.

Method Summary

static int	age(Date birthday)
static Comparator<Date>	createBirthdayComparator() returns a newly created comparator that will compare the dates by ignoring the year
static Date	dayBegin(Date d) returns a date that is set to the begin of the given day (daytime 12:00 a.m.)
static int	dayOfWeek(Date date)
static Date	monthBegin(Date d)
static Date	nextDay(Date d) returns a date that is exactly a day later
static Date	nextMonth(Date d) returns a date that is exactly a month later
static Date	nextWeek(Date d) returns a date that is exactly a week later
static Date	nextYear(Date d) returns a date that is exactly a year later
static int	offset(Date date) returns the offset that must be adjusted due to timezone specific daylight saving times
static boolean	sameDay(Date d1, Date d2) returns true only if the two dates are within the same day
static void	setCalendar(Calendar calendar) by default, the standard GregorianCalendar is used
static int	timeInDay(Date date) returns milliseconds from the beginning of the day
static Date	weekBegin(Date d)
static Date	yearBegin(Date d)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ietfDateFormat

public static final SimpleDateFormat ietfDateFormat

the IETF date format is used in HTTP headers for displaying the date. Since Java deprecated java.util.Date.parse(String), this offers an easy way to make the IETF date format work in any non-deprecated API.

Method Detail

setCalendar

public static void setCalendar(Calendar calendar)

by default, the standard GregorianCalendar is used

dayOfWeek

public static int dayOfWeek(Date date)

See Also:

Calendar.DAY_OF_WEEK

timeInDay

public static int timeInDay(Date date)

returns milliseconds from the beginning of the day

offset

public static int offset(Date date)

returns the offset that must be adjusted due to timezone specific daylight saving times

sameDay

public static boolean sameDay(Date d1,
                              Date d2)

returns true only if the two dates are within the same day

dayBegin

public static Date dayBegin(Date d)

returns a date that is set to the begin of the given day (daytime 12:00 a.m.)

weekBegin

public static Date weekBegin(Date d)

monthBegin

public static Date monthBegin(Date d)

yearBegin

public static Date yearBegin(Date d)

nextDay

public static Date nextDay(Date d)

returns a date that is exactly a day later

nextWeek

public static Date nextWeek(Date d)

returns a date that is exactly a week later

nextMonth

public static Date nextMonth(Date d)

returns a date that is exactly a month later

nextYear

public static Date nextYear(Date d)

returns a date that is exactly a year later

age

public static int age(Date birthday)

createBirthdayComparator

public static Comparator<Date> createBirthdayComparator()

returns a newly created comparator that will compare the dates by ignoring the year