Example usage for android.text.format Time EPOCH_JULIAN_DAY

List of usage examples for android.text.format Time EPOCH_JULIAN_DAY

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Introduction

In this page you can find the example usage for android.text.format Time EPOCH_JULIAN_DAY.

Prototype

int EPOCH_JULIAN_DAY

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Document

The Julian day of the epoch, that is, January 1, 1970 on the Gregorian calendar.

Usage

From source file:Main.java

/**
 * Returns the week since {@link Time#EPOCH_JULIAN_DAY} (Jan 1, 1970)
 * adjusted for first day of week.//from w  w  w  .  j ava2  s .c o  m
 * <p/>
 * This takes a julian day and the week start day and calculates which
 * week since {@link Time#EPOCH_JULIAN_DAY} that day occurs in, starting
 * at 0. *Do not* use this to compute the ISO week number for the year.
 *
 * @param julianDay      The julian day to calculate the week number for
 * @param firstDayOfWeek Which week day is the first day of the week,
 *                       see {@link Time#SUNDAY}
 * @return Weeks since the epoch
 */
public static int getWeeksSinceEpochFromJulianDay(int julianDay, int firstDayOfWeek) {
    int diff = Time.THURSDAY - firstDayOfWeek;
    if (diff < 0) {
        diff += 7;
    }
    int refDay = Time.EPOCH_JULIAN_DAY - diff;
    return (julianDay - refDay) / 7;
}