Java8日期
<h5>日期、字符串互转</h5>
<pre><code>String date = "2012-02-11 12:23:23";
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
//字符串转日期
LocalDateTime localDateTime = LocalDateTime.parse(date, dateTimeFormatter).plusMonths(3);
//日期转字符串
System.out.println(dateTimeFormatter.format(localDateTime));
//LoclDateTime 转 Date
LocalDateTime localDateTime = LocalDateTime.now();
Date date = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
System.out.println(date);
//Date 转 LocalDateTime
LocalDate localDateTime_ = Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDate();
System.out.println(localDateTime_);</code></pre>
<h5>计算</h5>
<pre><code>LocalDateTime localDateTime = LocalDateTime.now();
String string = "2018-12-01 23:22:22";
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime start = LocalDateTime.parse(string, dateTimeFormatter);
Duration duration = Duration.between(start, localDateTime);
long days = duration.toDays();
System.out.println("天数：" + days);
long seconds = duration.getSeconds();
System.out.println("秒数:" + seconds);</code></pre>
<h5>时间戳转日期</h5>
<pre><code> /**
* System.out.println(new Date().getTime()); 打印时间戳
* 时间戳转日期
*/
public static Date stampToTime(String stamp) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String sd = sdf.format(new Date(Long.parseLong(stamp))); // 时间戳转换日期
try {
Date date = sdf.parse(sd);
return date;
} catch (ParseException e) {
e.printStackTrace();
}
return new Date();
}</code></pre>