如何在java中将时间戳字符串转换为日期
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How to converted timestamp string to a date in java
提问by Rajeev
I have a string "1427241600000" and I want it converted to "yyyy-MM-dd" format.
我有一个字符串“1427241600000”，我希望它转换为“yyyy-MM-dd”格式。
I have tried, but I am not able to parse it, please review the below code
我试过了，但我无法解析它，请查看下面的代码
try {
String str = "1427241600000";
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
Date date =sf.parse(str);
System.out.println(date);
} catch (ParseException e) {
e.printStackTrace();
}
I would like to know where I went wrong.
我想知道我哪里出错了。
回答by Flown
You should try it the other way around. First get the Date out of the milliTime and then format it.
你应该反过来试试。首先从毫秒中获取日期，然后对其进行格式化。
String str = "1427241600000";
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date(Long.parseLong(str));
System.out.println(sf.format(date));
回答by Manish Kothari
Use Date date =new Date(Long.parseLong(str));to convert your String to Date object.
使用Date date =new Date(Long.parseLong(str));你的字符串转换为Date对象。
if you are using SimpleDateFormat()the format specified as a parameter to this function should match the format of the date in the String (str in your case). In your case yyyy-MM-dddoes not match the format of the time stamp (1427241600000).
如果您使用SimpleDateFormat()指定为该函数的参数的格式，则应与字符串中日期的格式（在您的情况下为 str ）相匹配。在您的情况下yyyy-MM-dd与时间戳的格式不匹配（1427241600000）。
回答by Paul
the conversion is highly dependent on what format the timestamp is in. But i assume the whole thing should actually be a longand is simply the systemtime from when the timestamp was created. So this should work:
转换高度依赖于时间戳的格式。但我认为整个事情实际上应该是一个long并且只是创建时间戳时的系统时间。所以这应该有效：
String str = ...;
Date date = new Date(Long.parseLong(str));
回答by GopinathSk
You can do it like this:
你可以这样做：
use a SimpleDateFormat with an appropriate format string (be careful to use the correct format letters, uppercase and lowercase have different meanings!).
使用带有适当格式字符串的 SimpleDateFormat（注意使用正确的格式字母，大写和小写有不同的含义！）。
DateFormat format = new SimpleDateFormat("MMddyyHHmmss");
Date date = format.parse("022310141505");
