Displaying AM and PM in lower case after date formatting

After formatting a datetime, the time displays AM or PM in upper case, but I want it in lower case like am or pm.

This is my code:

public class Timeis {
public static void main(String s[]) {
long ts = 1022895271767L;
String st = null;
st = new SimpleDateFormat(" MMM d 'at' hh:mm a").format(ts);
System.out.println("time is " + ts);
}
}
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最佳答案

Unfortunately the standard formatting methods don't let you do that. Nor does Joda. I think you're going to have to process your formatted date by a simple post-format replace.

String str = oldstr.replace("AM", "am").replace("PM","pm");

You could use the replaceAll() method that uses regepxs, but I think the above is perhaps sufficient. I'm not doing a blanket toLowerCase() since that could screw up formatting if you change the format string in the future to contain (say) month names or similar.

EDIT: James Jithin's solution looks a lot better, and the proper way to do this (as noted in the comments)

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Try this:

System.out.println("time is " + ts.toLowerCase());

Although you may be able to create a custom format as detailed here and here

Unfortunately out of the box the AM and PM do not seem to be customisable in the standard SimpleDateFormat class

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This works

public class Timeis {
public static void main(String s[]) {
long ts = 1022895271767L;
SimpleDateFormat sdf = new SimpleDateFormat(" MMM d 'at' hh:mm a");
// CREATE DateFormatSymbols WITH ALL SYMBOLS FROM (DEFAULT) Locale
DateFormatSymbols symbols = new DateFormatSymbols(Locale.getDefault());
// OVERRIDE SOME symbols WHILE RETAINING OTHERS
symbols.setAmPmStrings(new String[] { "am", "pm" });
sdf.setDateFormatSymbols(symbols);
String st = sdf.format(ts);
System.out.println("time is " + st);
}
}
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James's answer is great if you want different style other than default am, pm. But I'm afraid you need mapping between Locale and Locale specific AM/PM set to adopting the override. Now you simply use java built-in java.util.Formatter class. So an easy example looks like this:

System.out.println(String.format(Locale.UK, "%1$tl%1$tp", LocalTime.now()));

It gives:

9pm

To note that if you want upper case, just replace "%1$tp" with "%1$Tp". You can find more details at http://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html#dt.

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If you don't want to do string substitution, and are using Java 8 javax.time:

Map<Long, String> ampm = new HashMap<>();
ampm.put(0l, "am");
ampm.put(1l, "pm");


DateTimeFormatter dtf = new DateTimeFormatterBuilder()
.appendPattern("E M/d h:mm")
.appendText(ChronoField.AMPM_OF_DAY, ampm)
.toFormatter()
.withZone(ZoneId.of("America/Los_Angeles"));

It's necessary to manually build a DateTimeFormatter (specifying individual pieces), as there is no pattern symbol for lowercase am/pm. You can use appendPattern before and after.

I believe there is no way to substitute the default am/pm symbols, making this is the only way short of doing the string replace on the final string.

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just add toLowarCase() like this 

public class Timeis {
public static void main(String s[]) {
long ts = 1022895271767L;
String st = null;
st = new SimpleDateFormat(" MMM d 'at' hh:mm a").format(ts).toLowerCase();
System.out.println("time is " + ts);
}
}

and toUpperCase() if you want upper case

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Calendar c = Calendar.getInstance();


System.out.println("Current time => " + c.getTime());


SimpleDateFormat df = new SimpleDateFormat("HH:mm a");
String formattedDate = df.format(c.getTime());
formattedDate = formattedDate.replace("a.m.", "AM").replace("p.m.","PM");


TextView textView = findViewById(R.id.textView);
textView.setText(formattedDate);
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    String today = now.format(new DateTimeFormatterBuilder()
.appendPattern("MM/dd/yyyy ")
.appendText(ChronoField.AMPM_OF_DAY)
.appendLiteral(" (PST)")
.toFormatter(Locale.UK));

// output => 06/18/2019 am (PST)

Locale.UK => am or pm; Locale.US => AM or PM; try different locale for your needs (defaul, etc.)

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This is how we perform in android studio's java code pass unix timestamp as parameter

private String convertTimeToTimeStamp(Long timeStamp){
SimpleDateFormat sdf=new SimpleDateFormat("hh:mm aaa", Locale.getDefault());
return sdf.format(timeStamp);
}

function returns time of format 09:30 PM

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new SimpleDateFormat("MMM d 'at' hh:mm a", new Locale("en", "IN"));

change to a locale that uses am/pm instead of AM/PM.


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