Java 将 XX:XX AM/PM 转换为 24 小时制
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Converting XX:XX AM/PM to 24 Hour Clock
提问by user3505931
I have searched google and I cannot find out how you can take a string: xx:xx AM/PM(ex. 3:30 PM) and change it so that it is now in 24 hours.
我在谷歌上搜索过，但我不知道如何获取字符串：xx:xx AM/PM（例如下午 3:30）并将其更改为现在是 24 小时后。
So for example the previous time would be "15:30". I have looked into simply using if then statements to manipulate the string, however it seems very tedious. Is there any easy way to do this?
例如，之前的时间是“15:30”。我已经研究过简单地使用 if then 语句来操作字符串，但这似乎很乏味。有什么简单的方法可以做到这一点吗？
Input: 3:30 PM
Expected Output: 15:30
采纳答案by Braj
Try
尝试
String time = "3:30 PM";
SimpleDateFormat date12Format = new SimpleDateFormat("hh:mm a");
SimpleDateFormat date24Format = new SimpleDateFormat("HH:mm");
System.out.println(date24Format.format(date12Format.parse(time)));
output:
输出：
15:30
回答by Matej ?pilár
SimpleDateFormat inFormat = new SimpleDateFormat("hh:mm aa");
SimpleDateFormat outFormat = new SimpleDateFormat("HH:mm");
String time24 = outFormat.format(inFormat.parse(yourTimeString));
also you can read more about converting times here http://deepeshdarshan.wordpress.com/2012/08/17/how-to-change-time-from-12-hour-format-to-24-hour-format-in-java/
您也可以在此处阅读有关转换时间的更多信息http://deepeshdarshan.wordpress.com/2012/08/17/how-to-change-time-from-12-hour-format-to-24-hour-format-in -java/
回答by Rod_Algonquin
try this:
String string = "3:35 PM";
Calendar calender = Calendar.getInstance();
DateFormat format = new SimpleDateFormat( "hh:mm aa");
Date date;
date = format.parse( string );
calender.setTime(date);
System.out.println("Hour: " + calender.get(Calendar.HOUR_OF_DAY));
System.out.println("Minutes: " + calender.get(Calendar.MINUTE))
;
;
works fine and same result as what you would like.
工作正常，结果与您想要的相同。
回答by slaadvak
Here is a link to the SimpleDateFormat Javadoc
This is the way to go :
这是要走的路 ：
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class TimeParsing {
public static void main(String[] args) {
try {
// Declare a date format for parsing
SimpleDateFormat dateParser = new SimpleDateFormat("h:mm a");
// Parse the time string
Date date = dateParser.parse("3:30 PM");
// Declare a date format for printing
SimpleDateFormat dateFormater = new SimpleDateFormat("HH:mm");
// Print the previously parsed time
System.out.println(dateFormater.format(date));
} catch (ParseException e) {
System.err.println("Cannot parse this time string !");
}
}
}
Console output is : 15:30
控制台输出是： 15:30
回答by Manny Shirazy
Mine did not work till I added Locale like this:
在我像这样添加 Locale 之前，我的没有工作：
SimpleDateFormat date12Format = new SimpleDateFormat("hh:mm aa", Locale.US);
