Package net.fortuna.ical4j.util

Class Dates

  • public final class Dates
extends Object
    $Id$ Created on 26/06/2005 Implements a collection of utility methods relevant to date processing.

    • Field Detail

      • MILLIS_PER_SECOND

        public static final long MILLIS_PER_SECOND
        Number of milliseconds in one second.
        See Also:
        Constant Field Values

      • MILLIS_PER_MINUTE

        public static final long MILLIS_PER_MINUTE
        Number of milliseconds in one minute.
        See Also:
        Constant Field Values

      • MILLIS_PER_HOUR

        public static final long MILLIS_PER_HOUR
        Number of milliseconds in one hour.
        See Also:
        Constant Field Values

      • MILLIS_PER_DAY

        public static final long MILLIS_PER_DAY
        Number of milliseconds in one day.
        See Also:
        Constant Field Values

      • MILLIS_PER_WEEK

        public static final long MILLIS_PER_WEEK
        Number of milliseconds in one week.
        See Also:
        Constant Field Values

      • DAYS_PER_WEEK

        public static final int DAYS_PER_WEEK
        Number of days in one week.
        See Also:
        Constant Field Values

      • PRECISION_SECOND

        public static final int PRECISION_SECOND
        Constant indicating precision to the second.
        See Also:
        Constant Field Values

      • PRECISION_DAY

        public static final int PRECISION_DAY
        Constant indicating precision to the day.
        See Also:
        Constant Field Values

      • MAX_WEEKS_PER_YEAR

        public static final int MAX_WEEKS_PER_YEAR
        Maximum number of weeks per year.
        See Also:
        Constant Field Values

      • MAX_DAYS_PER_YEAR

        public static final int MAX_DAYS_PER_YEAR
        Maximum number of days per year.
        See Also:
        Constant Field Values

      • MAX_DAYS_PER_MONTH

        public static final int MAX_DAYS_PER_MONTH
        Maximum number of days per month.
        See Also:
        Constant Field Values

    • Method Detail

      • getAbsWeekNo

        public static int getAbsWeekNo​(Date date,
                               int weekNo)
        Returns the absolute week number for the year specified by the supplied date. Note that a value of zero (0) is invalid for the weekNo parameter and an IllegalArgumentException will be thrown.
        Parameters:
        date - a date instance representing a week of the year
        weekNo - a week number offset
        Returns:
        the absolute week of the year for the specified offset

      • getAbsYearDay

        public static int getAbsYearDay​(Date date,
                                int yearDay)
        Returns the absolute year day for the year specified by the supplied date. Note that a value of zero (0) is invalid for the yearDay parameter and an IllegalArgumentException will be thrown.
        Parameters:
        date - a date instance representing a day of the year
        yearDay - a day of year offset
        Returns:
        the absolute day of month for the specified offset

      • getAbsMonthDay

        public static int getAbsMonthDay​(Date date,
                                 int monthDay)
        Returns the absolute month day for the month specified by the supplied date. Note that a value of zero (0) is invalid for the monthDay parameter and an IllegalArgumentException will be thrown.
        Parameters:
        date - a date instance representing a day of the month
        monthDay - a day of month offset
        Returns:
        the absolute day of month for the specified offset

      • getInstance

        public static Date getInstance​(Date date,
                               Value type)
        Returns a new date instance of the specified type. If no type is specified a DateTime instance is returned.
        Parameters:
        date - a seed Java date instance
        type - the type of date instance
        Returns:
        an instance of net.fortuna.ical4j.model.Date

      • getCalendarInstance

        public static Calendar getCalendarInstance​(Date date)
        Returns an instance of java.util.Calendar that is suitably initialised for working with the specified date.
        Parameters:
        date - a date instance
        Returns:
        a java.util.Calendar

      • getDateListInstance

        public static DateList getDateListInstance​(DateList origList)
        Instantiate a new datelist with the same type, timezone and utc settings as the origList.
        Parameters:
        origList -
        Returns:
        a new empty list.

      • round

        public static long round​(long time,
                         int precision)
        Deprecated.
        It is not all that useful to perform rounding without specifying an explicit timezone.
        Parameters:
        time - the time value to round
        precision - the rounding precision
        Returns:
        a round time value

      • round

        public static long round​(long time,
                         int precision,
                         TimeZone tz)
        Rounds a time value to remove any precision smaller than specified.
        Parameters:
        time - the time value to round
        precision - the rounding precision
        tz - the timezone of the rounded value
        Returns:
        a round time value

      • getCurrentTimeRounded

        public static long getCurrentTimeRounded()
        Returns the System.currentTimeMillis(), rounded to the second.

        By doing a rough rounding here, we avoid an expensive java.util.Calendar based rounding later on.

        Returns:
        the current time in millisec.