将纪元字符串转换为 Java 日期
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Convert epoch String to Java date
提问by Pi Horse
I am getting an epoch String from my DB which looks something like this : 1391328000000
我从我的数据库中得到一个纪元字符串，它看起来像这样：1391328000000
I am having a hard time trying to convert it to Java Date.
我很难将其转换为 Java 日期。
I tried the following :
我尝试了以下方法：
private String buildDate(String dateString){
System.out.println("dateString " + dateString);
DateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
format.setTimeZone(TimeZone.getTimeZone("Etc/UTC"));
String formatted = format.format(Integer.parseInt(dateString));
return formatted;
}
采纳答案by Andrei Nicusan
I think you're overthinking about the DateFormat. If I want to simply obtain a Dateinstance, what I would try is the following:
我认为你对DateFormat. 如果我只想获取一个Date实例，我会尝试以下内容：
Date d = new Date(Long.parseLong(dateString));
回答by Daniel Martin
You need to turn it into a java.util.Dateobject in order for SimpleDateFormatto handle it. Also, a value like what you quoted needs to be parsed as a long, as it is too large for an int.
你需要把它变成一个java.util.Date对象才能SimpleDateFormat处理它。此外，您引用的值需要解析为 a long，因为它对于int.
That is, change the line where you set formattedto be:
也就是说，更改您设置的行formatted：
String formatted = format.format(new Date(Long.parseLong(dateString)));
As an aside, if the project you're working on can handle an extra external dependency, switch date/time handling over to the joda library. The stuff in java.util(that is, Dateand Calendar) rapidly becomes painful and error-prone to work with.
顺便说一句，如果您正在处理的项目可以处理额外的外部依赖项，请将日期/时间处理切换到joda 库。在东西java.util（即Date和Calendar）迅速变得痛苦且容易出错与工作。
