Java Date Format Conversion Questions

I'm having trouble with Java programming.Please let me know if you know.

画面 I would like to convert the date yyyy/MM/dd HH:mm:ss (JST) entered in the text box on the screen to UTC and UnixTime, and I would like to convert UnixTime to UTC and JST. What should I do?

テキスト I want to convert the values entered in the text box after obtaining them as follows, and display the converted values in a different text box.
text1.getText()

下記 As shown below, when I press the current time button, I try to output the time, but please tell me how to press the stop button to stop and clear the value in the text box.

if("current time".equals(cmdName)){
  // "red" processing"
  SwingUtilities.invokeLater(newRunnable(){
    public void run() {

      // Obtain UTC time from the ZonedDateTime class
      ZonedDateTime utc_time
      = ZoneDateTime.now(ZoneId.of("UTC"));

      // Get JST time from the ZonedDateTime class
      ZonedDateTime jst_time
      = ZoneDateTime.now(ZoneId.of("Asia/Tokyo"));

      // Get unixtime in the ZonedDateTime class
      longunix_time = System.currentTimeMillis()/1000;

      // Display format conversion between UTS and JST time (yyyy/mm/dd hh:mm:ss)
      String utc_aft = String.format("%1$tY/%1$tm/%1$td%1$tH:%1$tM:%1$tS", utc_time);
      String jst_aft = String.format("%1$tY/%1$tm/%1$td%1$tH:%1$tM:%1$tS", jst_time);
      String UNIX = String.valueOf(unix_time);

      text1.setText(utc_aft);
      text2.setText(jst_aft);
      text3.setText (UNIX);

      SwingUtilities.invokeLater(this);
    }
  });
}

I'm sorry, but I appreciate your cooperation.

java

2022-09-30 16:36

2 Answers

//import java.time.LocalDateTime;
// import java.time.ZoneId;
// import java.time.ZonedDateTime;
// import java.time.format.DateTimeFormatter;
// import javax.swing.SwingUtilities;

private boolean isStopped = true;

private void doAction (String cmdName) {

    if("current time".equals(cmdName)){
        isStopped=false;
        // "red" processing"
        SwingUtilities.invokeLater(newRunnable(){
            public void run() {
                if(isStopped){
                    text1.setText("");
                    text2.setText("");
                    text3.setText("");
                    return;
                }

                // Get JST time from the ZonedDateTime class
                ZoneId JST = ZoneId.of ("Asia/Tokyo");
                ZonedDateTime jst_time = ZonedDateTime.now(JST);

                // Display format conversion of JST time (yyyy/mm/dd hh:mm:ss)
                DateTimeFormatter formatter=DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
                String jst_aft = format.format(jst_time);
                text2.setText(jst_aft);

                // Get string as JST
                jst_aft = text2.getText();
                ZonedDateTime parsedJst = LocalDateTime.parse(jst_aft, formatter).atZone(JST);
                // Obtain UTC and unixtime from JST time
                ZoneDateTimeutc_time=parsedJst.withZoneSameInstant(ZoneId.of("UTC"));
                longunix_time = parsedJst.toEpochSecond();

                String utc_aft = format.format(utc_time);
                String UNIX = String.valueOf(unix_time);

                text1.setText(utc_aft);
                text3.setText (UNIX);

                SwingUtilities.invokeLater(this);
            }
        });
    } else if("stop".equals(cmdName)){
        isStopped = true;
    }
}

DateTimeFormatter.ofPatternThe string to be given as the method argument ("yyyy/MM/dd HH:mm:ss" in the above code) is described in the API document

2022-09-30 16:36

Conversion from UnixTime is as follows:
You can convert to a string like format.format(utcTime).

画面 I would like to convert the date entered in the text box on the screen: format yyyy/MM/dd HH:mm:ss (JST) to UTC and UnixTime.

static final ZoneId UTC=ZoneId.of("UTC");
static finalZoneIdJST=ZoneId.of("Asia/Tokyo");
static final DateTimeFormatter formatter=DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");

// abbreviation

final String jstText=text1.getText();

finalZonedDateTime jstTime = ZonedDateTime.parse(jstText, formatter.withZone(JST));
finalZoneDateTimeutcTime=jstTime.withZoneSameInstant (UTC);
final long unixTime=utcTime.toInstant().getEpochSecond();

Also, I would like to convert UnixTime to the above format of UTC and JST.What should I do?

static final ZoneId UTC=ZoneId.of("UTC");
static finalZoneIdJST=ZoneId.of("Asia/Tokyo");

// abbreviation

final long unixTime=// omitted

finalZonedDateTimeutcTime=ZonedDateTime.from (Instant.ofEpochSecond(unixTime).atZone(UTC))
finalZoneDateTime jstTime=utcTime.withZoneSameInstant(JST);

2022-09-30 16:36

If you have any answers or tips

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