[英]Convert HHMM String to GMT format in Java
I need to convert a String of the form HHMM (in EST or EDT - today) into a GMT timestamp of the form YYYYMMDD-HH:MM:SS.我需要将 HHMM 形式的字符串(在 EST 或 EDT - 今天)转换为 YYYYMMDD-HH:MM:SS 形式的 GMT 时间戳。 So if I get 1512, I want to express 3:12EDT in the GMT time and format: 20110714-20:12:00.
因此,如果我得到 1512,我想以 GMT 时间和格式表示 3:12EDT:20110714-20:12:00。 How can I do this?
我怎样才能做到这一点?
I have tried the following code and it does not convert at all.我已经尝试了以下代码,但它根本没有转换。
int hour = Integer.parseInt(HHMM.substring(0, 2));
int min = Integer.parseInt(HHMM.substring(2, 4));
Date day = new Date();
day.setHours(hour);
day.setMinutes(min);
day.setSeconds(00);
DateFormat gmtFormat = new SimpleDateFormat();
gmtFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
gmtFormat.format(day);
return day.getYear() + "" + day.getMonth() + "" +
day.getDate() + "-" + day.getHours() + ":" +
day.getMinutes() + ":" + day.getSeconds();
It's a bit shorter and clearer (IMO) in Joda :在Joda中它更短更清晰(IMO):
public static String printIsoTime(String hhmm) {
DateTimeFormatter fmt = DateTimeFormat.forPattern("HHmm");
// construct datetime from local midnight + parsed hhmm
DateTime localDateTime = new LocalDate().toDateTime(
fmt.parseDateTime(hhmm).toLocalTime());
// convert to UTC and print in ISO format
return ISODateTimeFormat.dateHourMinuteSecond()
.print(localDateTime.withZone(DateTimeZone.UTC));
}
How about,怎么样,
//obtain a formatted string with the year day month information for today
Date today = new Date();
SimpleDateFormat todaySdf = new SimpleDateFormat("yyyyMMdd-");
String todaySdfString = todaySdf.format(today);
//now concatenate today's info from above with the time info and then parse the whole thing
SimpleDateFormat edtFormat = new SimpleDateFormat("yyyyMMdd-HH:mmz");
Date dt = edtFormat.parse(todaySdfString+"15:12EDT");
//now GMT
SimpleDateFormat gmtFormat = new SimpleDateFormat("yyyyMMdd-HH:mm:ss");
gmtFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
String fmtDt = gmtFormat.format(dt);
System.out.println("fmtDt = " + fmtDt);
You should really be using Calendar, but the way you have it set up now this should work:你真的应该使用日历,但是你现在设置它的方式应该可以工作:
Date day = new Date();
day.setHours(3);
day.setMinutes(12);
day.setSeconds(00);
SimpleDateFormat gmtFormat = new SimpleDateFormat("yyyyMMdd-hh:mm:ss");
gmtFormat.setTimeZone(TimeZone.getTimeZone("GMT") );
Date fmtDay = gmtFormat.format(day);
System.out.println("fmtDay: " + fmtDay);
Thank you for your responses, I combined a few answers to end up with the following code which correctly converts to GMT and gives me the formatted String I require.感谢您的回复,我结合了一些答案,最终得到了以下代码,该代码正确转换为 GMT 并为我提供了我需要的格式化字符串。
private static String convertHHMMtoGMT(String HHMM)
{
Calendar day = Calendar.getInstance();
day.set(Calendar.HOUR_OF_DAY, hour);
day.set(Calendar.MINUTE, min);
day.set(Calendar.SECOND, 00);
day.set(Calendar.MILLISECOND, 00);
SimpleDateFormat gmtFormat = new SimpleDateFormat("yyyyMMdd-HH:mm:ss");
gmtFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
return gmtFormat.format(day.getTime());
}
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