DateTime format needed chnages as expected

Question

I want to display time as "02 Sep 2020 at 12:24 AM" (mind the at between date and time).

The current format I am using is "dd MMM yyyy hh:mm aaa",
which displays time as "28 Aug 2020 11:32 AM".

How can I put an at before the time?

Answer 1

You can add string literals to a date format by surrounding them with single quotes ('):

SimpleDateFormat sdf = new SimpleDateFormat("dd MMM yyyy 'at' hh:mm aaa");
// Here -------------------------------------------------^--^

String formatted = sdf.format(myDateVariable);

Answer 2

Just wrap the word in single quotes.

"dd MMM yyyy 'at' hh:mm aaa"

Answer 3

If you use java.time for this, you can define a java.time.format.DateTimeFormatter to parse a String, use it to parse the String to a java.time.LocalDateTime and define & use another DateTimeFormatter that includes the at escaping it in the pattern by enclosing it in single-quotes:

public static void main(String[] args) {
    String dateTime = "02 Sep 2020 12:24 AM";
    DateTimeFormatter parserDtf = DateTimeFormatter.ofPattern("dd MMM uuuu hh:mm a",
                                                                Locale.ENGLISH);
    DateTimeFormatter outputDtf = DateTimeFormatter.ofPattern("dd MMM uuuu 'at' hh:mm a",
                                                                Locale.ENGLISH);
    LocalDateTime ldt = LocalDateTime.parse(dateTime, parserDtf);
    System.out.println(ldt.format(outputDtf));
}

This code produces the output

02 Sep 2020 at 12:24 AM

Answer 4

SimpleDateFormat formatter = new SimpleDateFormat("dd MMM yyyy 'at' HH:mm:ss z"); 
Date date = new Date(System.currentTimeMillis()); 
System.out.println(formatter.format(date));