原文:https://blog.csdn.net/u013823538/article/details/80197476
public class DateUtil { public static final FastDateFormat FORMAT_yyyyMMddHHmmss=FastDateFormat.getInstance("yyyy-MM-dd HH:mm:ss"); public static final FastDateFormat FORMAT_yyyyMMdd=FastDateFormat.getInstance("yyyy-MM-dd"); public static final FastDateFormat FORMAT_yyMMdd=FastDateFormat.getInstance("yy-MM-dd"); public static final FastDateFormat FORMAT_HHmmss=FastDateFormat.getInstance("HH:mm:ss"); /** * 最常用的格式化10位时间戳为yyyyMMddHHmmss * @return */ public static String getNormalTime(String timestamp){ return FORMAT_yyyyMMddHHmmss.format(getDate(timestamp)); } /** * 获得10位时间戳 * @param date * @return */ public static String getTimestamp(Date date){ return String.valueOf(date.getTime()/1000); } /** * 10位时间戳转日期 * @param timestamp * @return */ public static Date getDate(String timestamp){ return new Date(Long.valueOf(timestamp+"000")); } /** * 获得本周开始时间 * @return */ public static Date getStartOfThisWeek() { Calendar calendar=Calendar.getInstance(); calendar.setTime(new Date()); calendar.setFirstDayOfWeek(Calendar.MONDAY);; 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.getTime(); } public static void main(String[] args) { getStartOfThisWeek(); } /** * 获得本周开始时间 * @return */ public static String getStartOfThisWeekString() { return String.valueOf(getStartOfThisWeek().getTime()/1000); } /** * 获得本月开始时间 * @return */ public static Date getStartOfThisMonth() { Calendar calendar=Calendar.getInstance(); calendar.setTime(new Date()); calendar.set(Calendar.DAY_OF_MONTH, 1); calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); return calendar.getTime(); } /** * 获得本月开始时间 * @return */ public static String getStartOfThisMonthString() { return String.valueOf(getStartOfThisMonth().getTime()/1000); } }