DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'SSSX");
df.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println("Current date and time in GMT: " + df.format("2017-01-04"));
以上是我的代码,当我尝试将日期转换为gmt
时,我收到错误:
线程中的异常" main" java.lang.IllegalArgumentException:不能 格式给定对象作为日期在 java.text.DateFormat.format(DateFormat.java:310)at java.text.Format.format(Format.java:157)at Sample.main(Sample.java:24)
请指出我做错了什么。
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'SSSX");
df.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println("Current date and time in GMT: " + df.format(new Date()));
上面的代码工作正常,但我需要适合任何日期的东西。
当我尝试这段代码时:
try {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'SSSX");
df.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println("Current date and time in GMT: " + df.parse("2017-01-04"));
} catch(Exception e) {
e.printStackTrace();
}
我得到了Unparseable date: "2017-01-04"
。请告诉我如何解决它
答案 0 :(得分:2)
如果您有日期对象,则可以根据需要对其进行格式化:
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
format.setTimeZone(TimeZone.getTimeZone("GMT"));
//create a calendar representing your date.
Calendar cal = Calendar.getInstance();
cal.set(2017, 01, 04);
//format the date object to the pattern you want.
String DateToStr = format.format(cal.getTime());
System.out.println(DateToStr);
如果你的日期是字符串,你也可以这样做:
String string = "2017-01-04";
DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
format1.setTimeZone(TimeZone.getTimeZone("GMT"));
Date date = null;
try {
date = format1.parse(string);
} catch (Exception ex) {
ex.printStackTrace();
}
System.out.println(date);
答案 1 :(得分:2)
试试..
String s = "2016-11-21 13:30:0.0";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss);
Date d = null;
try
{
d = format.parse(s);
} catch (ParseException e)
{
e.printStackTrace();
}
SimpleDateFormat gmtFormat = new SimpleDateFormat("yyyy-MM-dd'T'SSSX");
gmtFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println(gmtFormat.format(d));
答案 2 :(得分:0)
以下代码有助于更好地理解 - 您可以尝试取消注释注释行并比较结果。整个区块中您感兴趣的是gdf.parse(gmtFormat)
Date date = new Date();
DateFormat idf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
idf.setTimeZone(TimeZone.getTimeZone("IST"));
DateFormat gdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
gdf.setTimeZone(TimeZone.getTimeZone("GMT"));
//String istFormat = idf.format(date);
//System.out.println("IST: "+istFormat);
String gmtFormat = gdf.format(date);
System.out.println("GMT: "+ gmtFormat);
try {
//System.out.println("gmt parsed from istFormat: "+gdf.parse(istFormat));
//System.out.println("ist parsed from istFormat: "+idf.parse(istFormat));
System.out.println("gmt parsed from gmtFormat: "+gdf.parse(gmtFormat));
System.out.println("ist parsed from gmtFormat: "+idf.parse(gmtFormat));
} catch (ParseException e) {
e.printStackTrace();
}