How we can convert yyyy-MM-dd-HH.mm.ss.SSSSSS to yyyy-MM-dd'T'HH:mm:ss.SSSz in Java?

Question

Can anybody let me know,how we can convert date in yyyy-MM-dd-HH.mm.ss.SSSSSS format to date in yyyy-MM-dd\'T\'HH:mm:ss.SSSz in Java,where in both

Answer 1

Java 8+

You could also use the newer Time API in Java 8, something like...

String formatIn = "yyyy-MM-dd-HH.mm.ss.SSSSSS";
String formatOut = "yyyy-MM-dd'T'HH:mm:ss.SSSz";

String valueIn = "2016-01-19-09.55.00.000000";

LocalDateTime ldt = LocalDateTime.parse(valueIn, DateTimeFormatter.ofPattern(formatIn));
System.out.println("< " + ldt);

ZonedDateTime zdt = ZonedDateTime.of(ldt, ZoneId.systemDefault());        
String out = DateTimeFormatter.ofPattern(formatOut).format(zdt);
System.out.println("> " + out);

Which outputs...

< 2016-01-19T09:55
> 2016-01-19T09:55:00.000AEDT

This makes you far more responsible for managing the time zones which might be a better solution generally

And because converting between time zones in the Java 8 API gives me a headache (lack of experience :P)

LocalDateTime ldt = LocalDateTime.parse(valueIn, DateTimeFormatter.ofPattern(formatIn));
System.out.println("< " + ldt);

ZonedDateTime here = ldt.atZone(ZoneId.systemDefault());
System.out.println("here " + here);

ZonedDateTime there = here.withZoneSameInstant(ZoneId.of("GMT"));
System.out.println("there " + there);
String out = DateTimeFormatter.ofPattern(formatOut).format(there);
System.out.println("> " + out);

Which outputs...

< 2016-01-19T09:55
here 2016-01-19T09:55+11:00[Australia/Sydney]
there 2016-01-18T22:55Z[GMT]
> 2016-01-18T22:55:00.000GMT

FYI: I think your input is using nano/micro seconds and not milliseconds (there's only 1000 milliseconds in a second). SimpleDateFormat does not support nano/micro seconds, but DateTimeFormatter does, you'd have to use the n pattern, yyyy-MM-dd-HH.mm.ss.nnnnnn for example

Java 7 and below

The basic answer is, use a SimpleDateFormat....

String formatIn = "yyyy-MM-dd-HH.mm.ss.SSSSSS";
String formatOut = "yyyy-MM-dd'T'HH:mm:ss.SSSz";

String valueIn = "2016-01-19-09.55.00.000000";

SimpleDateFormat in = new SimpleDateFormat(formatIn);
SimpleDateFormat out = new SimpleDateFormat(formatOut);

Date dateIn = in.parse(valueIn);
System.out.println("< " + dateIn);

String valueOut = out.format(dateIn);
System.out.println("> " + valueOut);

Which outputs...

< Tue Jan 19 09:55:00 AEDT 2016
> 2016-01-19T09:55:00.000AEDT

The problem here is, you could be converting across different time zones, which case, you could use something like...

in.setTimeZone(TimeZone.getTimeZone("GMT"));
dateIn = in.parse(valueIn);
System.out.println("< " + dateIn);

out.setTimeZone(TimeZone.getTimeZone("GMT"));
valueOut = out.format(dateIn);
System.out.println("> " + valueOut);

which outputs

< Tue Jan 19 20:55:00 AEDT 2016
> 2016-01-19T09:55:00.000GMT

or a combination of, if you want to covert to a different time zone.

But, personally, I'd use Joda-Time, but that's me

Answer 2

        SimpleDateFormat s1 = new SimpleDateFormat("yyyy-MM-dd-HH.mm.ss.SSSSSS");
        SimpleDateFormat s2 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSz");
        Date d= s1.parse( "2015-11-11-02.01.11.000001" );
        String str= s2.format( d);
        System.out.println(str);

This parse the string date to a Date project using the SimpleDateFormat s1. Then it parse it to the desired form using a second SimpleDateFormat.