时间戳和日期之间的相互转换

Myth丶恋晨 2021-11-27 03:24 680阅读 0赞

获取时间戳（timeStamp)

*  return 精确到秒

public String getTimeStamp() {
        long time = System.currentTimeMillis();
        return String.valueOf(time / 1000);
    }

时间戳转换成日期格式字符串（timeStamp --> Date）

*  seconds 精确到秒的字符串

public String timeStamp2Date(String seconds, String format) {
        if (seconds == null || seconds.isEmpty() || seconds.equals("null")) {
            return "";
        }
        if (format == null || format.isEmpty()) {
            format = "yyyy-MM-dd HH:mm:ss";
        }
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date(Long.valueOf(seconds + "000")));
    }

日期格式字符串转换成时间戳（format --> timeStamp）

*  formatDate 字符串日期 yyyy-MM-dd HH:mm:ss

public String formatDate2TimeStamp(String formatDate, String format) {
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return String.valueOf(sdf.parse(formatDate).getTime() / 1000);
            } catch (Exception e) {
                e.printStackTrace();
        }
        return "";
    }

毫秒时间戳转换成日期格式字符串（seconds --> formatDate）

*  seconds 精确到秒的字符串

public String timeStampms2Date(String seconds, String format) {
        if (seconds == null || seconds.isEmpty() || seconds.equals("null")) {
            return "";
        }
        if (format == null || format.isEmpty()) {
            format = "yyyy-MM-dd HH:mm:ss";
        }
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date(Long.valueOf(seconds)));
    }

写个main方法简单测试上述方法：

public class DateUtilTest {
        public static void main(String[] args) {
            DateUtil du = new DateUtil();
    
            String timeStamp = du.getTimeStamp();
            System.out.println("取得当前时间戳timeStamp = " + timeStamp);
    
            String timeStampms = String.valueOf(System.currentTimeMillis());
            String formatDate = du.timeStampms2Date(timeStampms, "yyyy-MM-dd HH:mm:ss");
            System.out.println("毫秒时间戳转换成日期格式字符串seconds  -->  formatDate = " + formatDate);
    
            String date = du.timeStamp2Date(timeStamp, "yyyy-MM-dd HH:mm:ss");
            System.out.println("时间戳转换成日期格式字符串timeStamp -->  Date = " + date);
    
            String timeStamp2 = du.formatDate2TimeStamp(date, "yyyy-MM-dd HH:mm:ss");
            System.out.println("日期格式字符串转换成时间戳format  -->  timeStamp = " + timeStamp2);
        }
    }

测试结果：

![20190723170408300.png][]

[20190723170408300.png]: /images/20211126/3c54547a81ba4048baadf2a9e7ec194f.png