获取当前日期、时间、星期几、指定格式的日期时间、时间戳包含使用示例
使用示例
tvDate.setText(DateUtil.getNowDate());//获取当前日期 tvTime.setText(DateUtil.getNowTime());//获取当前时间 tvWeek.setText(DateUtil.getWeekOfDate(new Date()));//获取今天是星期几 tvNowDateTime.setText(DateUtil.getNowDateTime());获取当前完整的日期和时间 tvNowTimeDetail.setText(DateUtil.getNowTimeDetail());//获取当前完整的日期和时间包含毫秒
只要修改前面的控件就可以了，我是用的TextView，修改即可。
工具类代码
代码如下，复制粘贴改包名即可使用，
package com.llw.util; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateUtil { //获取当前完整的日期和时间 public static String getNowDateTime() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return sdf.format(new Date()); } //获取当前日期 public static String getNowDate() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); return sdf.format(new Date()); } //前一天 public static String getYesterday(Date date) { String tomorrow = ""; Calendar calendar = new GregorianCalendar(); calendar.setTime(date); calendar.add(calendar.DATE, -1); date = calendar.getTime(); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); tomorrow = formatter.format(date); return tomorrow; } //后一天 public static String getTomorrow(Date date) { String tomorrow = ""; Calendar calendar = new GregorianCalendar(); calendar.setTime(date); calendar.add(calendar.DATE, +1); date = calendar.getTime(); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); tomorrow = formatter.format(date); return tomorrow; } //获取当前时间 public static String getNowTime() { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss"); return sdf.format(new Date()); } //获取当前日期(精确到毫秒) public static String getNowTimeDetail() { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.SSS"); return sdf.format(new Date()); } //获取今天是星期几 public static String getWeekOfDate(Date date) { String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"}; Calendar cal = Calendar.getInstance(); cal.setTime(date); int w = cal.get(Calendar.DAY_OF_WEEK) - 1; if (w < 0) w = 0; return weekDays[w]; } //计算星期几 private static int getDayOfWeek(String dateTime) { Calendar cal = Calendar.getInstance(); if (dateTime.equals("")) { cal.setTime(new Date(System.currentTimeMillis())); } else { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()); Date date; try { date = sdf.parse(dateTime); } catch (ParseException e) { date = null; e.printStackTrace(); } if (date != null) { cal.setTime(new Date(date.getTime())); } } return cal.get(Calendar.DAY_OF_WEEK); } //根据年月日计算是星期几并与当前日期判断 非昨天、今天、明天 则以星期显示 public static String Week(String dateTime) { String week = ""; String yesterday = ""; String today = ""; String tomorrow = ""; yesterday = getYesterday(new Date()); today = getNowDate(); tomorrow = getTomorrow(new Date()); if (dateTime.equals(yesterday)) { week = "昨天"; } else if (dateTime.equals(today)) { week = "今天"; } else if (dateTime.equals(tomorrow)) { week = "明天"; } else { switch (getDayOfWeek(dateTime)) { case 1: week = "星期日"; break; case 2: week = "星期一"; break; case 3: week = "星期二"; break; case 4: week = "星期三"; break; case 5: week = "星期四"; break; case 6: week = "星期五"; break; case 7: week = "星期六"; break; } } return week; } //将时间戳转化为对应的时间(10位或者13位都可以) public static String formatTime(long time) { String times = null; if (String.valueOf(time).length() > 10) {// 10位的秒级别的时间戳 times = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(time * 1000)); } else {// 13位的秒级别的时间戳 times = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(time); } return times; } //将时间字符串转为时间戳字符串 public static String getStringTimestamp(String time) { String timestamp = null; try { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Long longTime = sdf.parse(time).getTime() / 1000; timestamp = Long.toString(longTime); } catch (ParseException e) { e.printStackTrace(); } return timestamp; } }
日期时间格式的定义说明
时间格式内部其余的横线“-”、空格“ ”、冒号“：”、点号“.”等字符仅仅是连接符，方便观看各种单位的时间数字而已，国内，也可以使用形如“yyyy年dd日HHmm分ss秒”的时间格式。
希望能帮到您，山高水长，后会有期~
