Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Calendar;

public class Main {
    public static final int TYPE_DAY = 1;
    public static final int TYPE_WEEK = 2;
    public static final int TYPE_MONTH = 3;
    public static final int TYPE_YEAR = 4;

    public static long getPeriodStart(int periodType, long date) {
        final Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(date);

        switch (periodType) {
        case TYPE_DAY: {
            cal.set(Calendar.HOUR_OF_DAY, 0);
            cal.set(Calendar.MINUTE, 0);
            cal.set(Calendar.SECOND, 0);
            cal.set(Calendar.MILLISECOND, 0);
            break;
        }

        case TYPE_WEEK: {
            cal.setFirstDayOfWeek(Calendar.MONDAY);
            final int currentDayOfWeek = (cal.get(Calendar.DAY_OF_WEEK) + 7 - cal.getFirstDayOfWeek()) % 7;
            cal.add(Calendar.DAY_OF_YEAR, -currentDayOfWeek);
            cal.set(Calendar.HOUR_OF_DAY, 0);
            cal.set(Calendar.MINUTE, 0);
            cal.set(Calendar.SECOND, 0);
            cal.set(Calendar.MILLISECOND, 0);
            break;
        }

        case TYPE_MONTH: {
            cal.set(Calendar.DAY_OF_MONTH, 1);
            cal.set(Calendar.HOUR_OF_DAY, 0);
            cal.set(Calendar.MINUTE, 0);
            cal.set(Calendar.SECOND, 0);
            cal.set(Calendar.MILLISECOND, 0);
            break;
        }

        case TYPE_YEAR: {
            cal.set(Calendar.MONTH, 0);
            cal.set(Calendar.DAY_OF_MONTH, 1);
            cal.set(Calendar.HOUR_OF_DAY, 0);
            cal.set(Calendar.MINUTE, 0);
            cal.set(Calendar.SECOND, 0);
            cal.set(Calendar.MILLISECOND, 0);
            break;
        }
        }
        return cal.getTimeInMillis();
    }
}