java如何获取两个日期的时间差

 @SuppressLint("SimpleDateFormat") SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); df.setTimeZone(TimeZone.getTimeZone("GMT+08"));// 这里一定要设置GMT时区 String currentTime = df.format(new Date()); Date date1 = MyDateUtil.parseDate(trainBeginTime.replace("T"," "), "yyyy-MM-dd HH:mm:ss"); Date date2 = MyDateUtil.parseDate(currentTime, "yyyy-MM-dd HH:mm:ss"); // 获取相差的天数 Calendar calendar = Calendar.getInstance(); calendar.setTime(date1); long timeInMillis1 = calendar.getTimeInMillis(); calendar.setTime(date2); long timeInMillis2 = calendar.getTimeInMillis(); long betweenDays = ((timeInMillis2 - timeInMillis1) / (1000L*3600L*24L))+2; textView.setText("时间相差"+betweenDays+"天");

 import android.os.Build; import androidx.annotation.RequiresApi; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.Instant; import java.time.LocalDate; import java.time.ZoneId; import java.time.ZonedDateTime; import java.util.Calendar; import java.util.Date; /** * Description: 日期工具类 */ public class MyDateUtil { /** * 将指定的日期字符串转换成日期 * @param dateStr 日期字符串 * @param pattern 格式 * @return 日期对象 */ public static Date parseDate(String dateStr, String pattern) { SimpleDateFormat sdf = new SimpleDateFormat(pattern); Date date; try { date = sdf.parse(dateStr); } catch (ParseException e) { throw new RuntimeException("日期转化错误"); } return date; } /** * 将指定的日期格式化成指定的日期字符串 * @param date 日期对象 * @param pattern 格式 * @return 格式化后的日期字符串 */ public static String dateFormate(Date date, String pattern) { SimpleDateFormat sdf = new SimpleDateFormat(pattern); String dateStr; if(date == null) { return ""; } dateStr = sdf.format(date); return dateStr; } /** * 查询指定日期前后指定的天数 * @param date 日期对象 * @param days 天数 * @return 日期对象 */ public static Date incr(Date date, int days) { if (date == null){ return null; } Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(Calendar.DAY_OF_MONTH, days); return calendar.getTime(); } /** * 将LocalDate日期转化成Date * @param localDate LocalDate对象 * @return Date对象 */ @RequiresApi(api = Build.VERSION_CODES.O) public static Date localDateToDate(LocalDate localDate) { if (localDate == null) { return null; } ZoneId zoneId = ZoneId.systemDefault(); ZonedDateTime zonedDateTime = localDate.atStartOfDay(zoneId); Date date = Date.from(zonedDateTime.toInstant()); return date; } /** * 将Date转成LocalDate对象 * @param date Date对象 * @return LocalDate对象 */ @RequiresApi(api = Build.VERSION_CODES.O) public static LocalDate dateToLocalDate(Date date) { if (date == null) { return null; } ZoneId zoneId = ZoneId.systemDefault(); Instant instant = date.toInstant(); LocalDate localDate = instant.atZone(zoneId).toLocalDate(); return localDate; } }