获取时间/日期工具类:格式化日期,获取当前时间,指定时间,上一月,指定时间的毫秒数-蒲公英云

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class DateTimeUtils {
    // 默认显示日期的格式
    public static final String DATE_FORMAT = "yyyy-MM-dd";
    // 默认显示日期时间的格式
    public static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
    // 默认显示日期时间的格式
    public static final String DATE_TIME_MILLIS_FORMAT = "yyyy-MM-dd HH:mm:ss.SSS";
    // 显示年月日时分的格式
    public static final String DATE_TIME_MINUTE_FORMAT = "yyyy-MM-dd HH:mm";
    private final static DateFormat mDateFormat = new SimpleDateFormat(DATE_FORMAT);
    private final static DateFormat mDateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
    private final static DateFormat mDateTimeMillisFormat = new SimpleDateFormat(DATE_TIME_MILLIS_FORMAT);
    private final static DateFormat mDataTimeMinuteFormat = new SimpleDateFormat(DATE_TIME_MINUTE_FORMAT);
    /**
     * @see 获取当前时间年份
     */
    public static int GetYear() {
        return Calendar.getInstance().get(Calendar.YEAR);
    }
    /**
     * @see 获取指定时间年份
     */
    public static int GetYear(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.YEAR);
    }
    /**
     * @see 获取上一个月的年份
     */
    public static int GetYearByLastMonth() {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, -1);
        return calendar.get(Calendar.YEAR);
    }
    /**
     * @see 获取当前时间月份
     */
    public static int GetMonth() {
        return Calendar.getInstance().get(Calendar.MONTH) + 1;
    }
    /**
     * @see 获取上一个月的月份
     */
    public static int GetLastMonth() {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, -1);
        return calendar.get(Calendar.MONTH) + 1;
    }
    /**
     * @see 获取指定时间月份
     */
    public static int GetMonth(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.MONTH) + 1;
    }
    /**
     * @see 获取当前时间日期
     */
    public static int GetMonthDay() {
        return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
    }
    /**
     * @see 获取指定时间日期
     */
    public static int GetMonthDay(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.DAY_OF_MONTH);
    }
    /**
     * @see 获取当前时间：Hour
     */
    public static int GetHour() {
        return Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
    }
    /**
     * @see 获取指定时间：Hour
     */
    public static int GetHour(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.HOUR_OF_DAY);
    }
    /**
     * @see 获取当前时间：Minute
     */
    public static int GetMinute() {
        return Calendar.getInstance().get(Calendar.MINUTE);
    }
    /**
     * @see 获取指定时间：Minute
     */
    public static int GetMinute(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.MINUTE);
    }
    /**
     * @see 获取当前时间：Second
     */
    public static int GetSecond() {
        return Calendar.getInstance().get(Calendar.SECOND);
    }
    /**
     * @see 获取指定时间：Second
     */
    public static int GetSecond(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.SECOND);
    }
    /**
     * @see 获取当前时间：Week
     */
    public static int GetWeek() {
        return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
    }
    /**
     * @see 获取指定时间：Week
     */
    public static int GetWeek(long time) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.get(Calendar.DAY_OF_WEEK);
    }
    /**
     * @see 是否为当月的第一天
     */
    public static boolean IsFristDayInMonth() {
        return 1 == GetMonthDay();
    }
    /**
     * @see 是否为当月的第一天
     */
    public static boolean IsFristDayInMonth(long time) {
        return 1 == GetMonthDay(time);
    }
    /**
     * @see 是否为当年的第一月
     */
    public static boolean IsFristMonthInYear() {
        return 1 == GetMonth();
    }
    /**
     * @see 是否为当年的第一月
     */
    public static boolean IsFristMonthInYear(long time) {
        return 1 == GetMonth(time);
    }
    /**
     * @see 当前时间 => 日期字符串 ： 年-月-日
     */
    public static String GetDateString() {
        return mDateFormat.format(new Date());
    }
    /**
     * @see 指定时间 => 日期字符串 ： 年-月-日
     */
    public static String ConvertToDateString(long time) {
        return mDateFormat.format(new Date(time));
    }
    /**
     * @see 日期字符串 => 指定时间
     */
    public static Date ConvertToDate(String date) throws Exception {
        return mDateFormat.parse(date);
    }
    /**
     * @see 当前时间 => 时间字符串 ： 年-月-日 时：分：秒
     */
    public static String GetDateTimeString() {
        return mDateTimeFormat.format(new Date());
    }
    /**
     * @see 指定时间 => 时间字符串 ： 年-月-日 时：分：秒
     */
    public static String ConvertToDateTimeString(long time) {
        return mDateTimeFormat.format(new Date(time));
    }
    /**
     * @see 时间字符串 => 指定时间 年:月:日
     */
    public static Date ConvertToDateTime(String date) throws Exception {
        return mDateTimeFormat.parse(date);
    }
    /**
     * @see 时间字符串 => 指定时间 年:月:日 时:分:秒
     */
    public static long ConvertToLongTimeWithDateTime(String dateTime) {
        try {
            return ConvertToDateTime(dateTime).getTime();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }
    /**
     * @see 时间字符串 => 指定时间
     */
    public static long ConvertToLongTimeWithDate(String date) {
        try {
            return ConvertToDate(date).getTime();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }
    /**
     * @see 获取时间字符串：年-月-日 时：分：秒.毫秒
     */
    public static String GetDateTimeMillisString() {
        return mDateTimeMillisFormat.format(new Date());
    }
    /**
     * @see 获取时间字符串：年-月-日 时：分
     */
    public static String GetDateTimeMinuteString() {
        return mDataTimeMinuteFormat.format(new Date());
    }
    /**
     * @return 昨日指定时间的毫秒数(24小时制)
     */
    public static long GetYesterdaywAppointedTime(int hour, int minute, int second) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, hour);
        calendar.set(Calendar.MINUTE, minute);
        calendar.set(Calendar.SECOND, second);
        calendar.set(Calendar.MILLISECOND, 0);
        calendar.add(Calendar.DAY_OF_MONTH, -1);
        return calendar.getTimeInMillis();
    }
    /**
     * @return 今日指定时间的毫秒数(24小时制)
     */
    public static long GetTodayAppointedTime(int hour, int minute, int second) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, hour);
        calendar.set(Calendar.MINUTE, minute);
        calendar.set(Calendar.SECOND, second);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTimeInMillis();
    }
    /**
     * @return 明日指定时间的毫秒数(24小时制)
     */
    public static long GetTomorrowAppointedTime(int hour, int minute, int second) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, hour);
        calendar.set(Calendar.MINUTE, minute);
        calendar.set(Calendar.SECOND, second);
        calendar.set(Calendar.MILLISECOND, 0);
        calendar.add(Calendar.DAY_OF_MONTH, +1);
        return calendar.getTimeInMillis();
    }
    /**
     * @return 获取周日24点的时间
     */
    public static long GetSundayZeroTime() {
        Calendar calendar = Calendar.getInstance();
        if (calendar.get(Calendar.DAY_OF_WEEK) > Calendar.SUNDAY) {
            calendar.add(Calendar.WEEK_OF_MONTH, 1);
        }
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTimeInMillis();
    }
    /**
     * @see 获取当前日期与指定日期相差的天数
     */
    public static int CompareByDay(String date) {
        try {
            return (int) (((new Date()).getTime() - ConvertToDate(date).getTime()) / (24 * 60 * 60 * 1000));
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }
    }
    /**
     * @see 是否为同一月
     */
    public static boolean IsCurrentMonth(long time) {
        return GetYear() == GetYear(time) && GetMonth() == GetMonth(time);
    }
    /**
     * @see 是否为同一天
     */
    public static boolean IsCurrentDay(long time) {
        return IsCurrentMonth(time) && GetMonthDay() == GetMonthDay(time);
    }
    /**
     * @see 根据上月总天数
     */
    public static int GetLastMonthDays() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_MONTH, 1);
        cal.add(Calendar.DAY_OF_MONTH, -1);
        return cal.get(Calendar.DAY_OF_MONTH);
    }
    /**
     * @see 获取当月总天数
     */
    public static int GetCurrentMonthDays() {
        Calendar a = Calendar.getInstance();
        a.set(Calendar.DATE, 1);
        a.roll(Calendar.DATE, -1);
        return a.get(Calendar.DATE);
    }
}