2020-04-03 20:17:46 to "yyyy-MM-dd'T'HH:mm:ss" format

Question

Is there any way in java(java.util.* or Joda api ) to convert "2020-04-03 20:17:46" to "yyyy-MM-dd'T'HH:mm:ss"

new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss")
          .parse("2020-04-03 20:17:46")

its giving java.text.parseException always

Answer 1

Just for the case you are using Java 8 or above, make use of java.time.
See this simple example:

public static void main(String[] args) {
    // example datetime
    String datetime = "2020-04-03 20:17:46";
    // create a formatter that parses datetimes of this pattern
    DateTimeFormatter parserDtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    // then parse the datetime with that formatter
    LocalDateTime ldt = LocalDateTime.parse(datetime, parserDtf);
    // in order to output the parsed datetime, use the default formatter (implicitly)
    System.out.println(ldt);
    // or format it in a totally different way
    System.out.println(ldt.format(
            DateTimeFormatter.ofPattern("EEE, dd. 'of' MMM 'at' hh-mm-ss a",
                    Locale.ENGLISH)
            )
    );
}

This outputs

2020-04-03T20:17:46
Fri, 03. of Apr at 08-17-46 PM

Please note that this doesn't consider any time zone or offset, it just represents a date and time consisting of the passed or parsed years, months, days, hours, minutes and seconds, nothing else.