日期格式转换

 

 

@Test
public void calendarTest() {
    Calendar calendar = Calendar.getInstance();
    System.out.println("calendar.getTime :" + calendar.getTime());
    System.out.println("calendar.getTime.getTime :" + calendar.getTime().getTime());
    System.out.println("new Date :" + new Date());
    System.out.println("calendar.getTimeZone :" + calendar.getTimeZone());
    System.out.println("system.currentTimeMillis :" + System.currentTimeMillis());
    try {
        /** Sat Oct 12 2019 14:19:40 GMT 0800 (中国标准时间)，该时间是格林尼治时间格式的时间*/
        String dataTime = "Sat Oct 12 2019 14:19:40 GMT+0800 (中国标准时间)";
        // 该pattern中的 E 标识星期，MMM标识月份
        String data = dataTime.replace("GMT", "").replaceAll("\\(.*\\)", "");
        // 将字符串转化为date类型，格式2016-10-12
        SimpleDateFormat format = new SimpleDateFormat("EEE MMM dd yyyy hh:mm:ss z", Locale.ENGLISH);
        System.out.println("中国标准时间(GMT): " + data);
        Date dateTrans = format.parse(data);
        SimpleDateFormat formatDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        // 将其转化解析可的日期为：2019-10-12 14:19:40
        String beijingTimeStr = formatDate.format(dateTrans);
        System.out.println("北京时间 :" + beijingTimeStr);

        dataTime = dataTime.substring(0, dataTime.indexOf('('));
        data1 = dataTime.replace("GMT+08", "GMT+08:");
        SimpleDateFormat format1 = new SimpleDateFormat("EEE MMM dd yyyy hh:mm:ss z", Locale.US);
        Date dateTrans1 = format1.parse(data1);
        String beijingTimeStr1 = formatDate.format(dateTrans1);
        System.out.println(dateTrans1);
        System.out.println(beijingTimeStr1);
    } catch (ParseException e) {
        e.printStackTrace();
    }
}

打印出来的结果：

calendar.getTime :Tue Sep 13 11:42:28 CST 2022
calendar.getTime.getTime :1663040548065
new Date :Tue Sep 13 11:42:28 CST 2022
calendar.getTimeZone :sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null]
system.currentTimeMillis :1663040548066
中国标准时间(GMT): Sat Oct 12 2019 14:19:40 +0800
北京时间 :2019-10-12 14:19:40
中国标准时间(GMT): Sat Oct 12 2019 14:19:40 GMT+08:00
Sat Oct 12 14:19:40 CST 2019
2019-10-12 14:19:40

 

有一种带T的时间格式 2020-01-01T21:30:03+08:00 和军事上带Z的格式 2019-10-14T13:41:45.223Z

参考:

https://www.cnblogs.com/zjdxr-up/p/12518209.html