TimeUtil.java

package com.wuxiaolong.androidsamples;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;

/**
 * Created by WuXiaolong on 2015/9/11.
 */
public class TimeUtil {


    /**
     * 获取当前时间
     *
     * @param format "yyyy-MM-dd HH:mm:ss"
     */
    public static String getCurrentTime(String format) {
        Date date = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format, Locale.getDefault());
        return simpleDateFormat.format(date);
    }

    /**
     * 获取当前时间为本月的第几周
     */
    public static int getWeekOfMonth() {
        Calendar calendar = Calendar.getInstance();
        int week = calendar.get(Calendar.WEEK_OF_MONTH);
        return week - 1;
    }

    /**
     * 获取当前时间为本周的第几天
     */
    public static int getDayOfWeek() {
        Calendar calendar = Calendar.getInstance();
        int day = calendar.get(Calendar.DAY_OF_WEEK);
        if (day == 1) {
            day = 7;
        } else {
            day = day - 1;
        }
        return day;
    }

    /**
     * 获取当前时间的年份
     */
    public static int getYear() {
        Calendar calendar = GregorianCalendar.getInstance();
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 获取当前时间的月份
     */
    public static int getMonth() {
        Calendar calendar = GregorianCalendar.getInstance();
        return calendar.get(Calendar.MONTH);
    }

    /**
     * 获取当前时间是哪天
     */
    public static int getDay() {
        Calendar calendar = GregorianCalendar.getInstance();
        return calendar.get(Calendar.DATE);
    }

    /**
     * @param date1
     * @param date2
     * @return 1:date1大于date2；
     * -1:date1小于date2
     */
    public static int compareDate(String date1, String date2, String format) {
        DateFormat df = new SimpleDateFormat(format, Locale.getDefault());
        try {
            Date dt1 = df.parse(date1);
            Date dt2 = df.parse(date2);
            if (dt1.getTime() > dt2.getTime()) {
                return 1;
            } else if (dt1.getTime() < dt2.getTime()) {
                return -1;
            } else {
                return 0;
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return 0;
    }
}