I got the error "java.text.ParseException: Unparseable date: "1/10/24 7:00 PM"" when trying to parse

Question

I have a date string as "1/10/24 7:00 PM" (10th Jan.2024). How to parse it using SimpleDateFormat?

String date_time = "1/10/24 7:00 PM";
Instant answer;
try {
    answer = Instant.parse(date_time);
} catch(DateTimeParseException ex) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat();
    simpleDateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
    answer = simpleDateFormat.parse(date_time).toInstant();
    System.out.println(answer);
}

Looks like that date isn't formatted according to the default pattern. Try and pass the correct pattern to the SimpleDateFormat constructor. — Federico klez Culloca
– Federico klez Culloca, Commented Jan 31, 2024 at 7:52
Stop using outdated classe like SimpleDateFormat use The DateTimeFormatter of the java.time API — Jens
– Jens, Commented Jan 31, 2024 at 7:52
You're already using the new java.time API (e.g. Instant), why do you want to revert to the older and more error prone old one based on java.util.Date (e.g. SimpleDateFormat) ? — Thomas
– Thomas, Commented Jan 31, 2024 at 7:53
simpleDateFormat.parse(date_time , new java.text.ParsePosition(0)) you are using an extremely old and flawed "Date" API , use java.time API "since Sun/Oracle 1.8.0 (open 11)" . parse position is only a placeholder for the internal method workings. — Samuel Marchant
– Samuel Marchant, Commented Jan 31, 2024 at 9:36
It’s not quite as complicated as you seem to think: Instant answer = LocalDateTime .parse(date_time, DateTimeFormatter.ofPattern("M/d/uu h:mm a", Locale.ENGLISH)) .atZone(ZoneId.systemDefault()) .toInstant();. <in my time zone it gave an Instant of 2024-01-10T18:00:00Z. — Anonymous
– Anonymous, Commented Feb 14, 2024 at 20:01

Arvind Kumar Avinash · Accepted Answer · 2024-02-14 22:01:49Z

I have a date string as "1/10/24 7:00 PM" (10th Jan.2024). How to parse it using SimpleDateFormat?

The java.util date-time API and their corresponding parsing/formatting type, SimpleDateFormat are outdated and error-prone. In March 2014, the modern Date-Time API supplanted the legacy date-time API. Since then, it has been strongly recommended to switch to java.time, the modern date-time API.

The given date-time string does not have time zone information; therefore, parse it into a LocalDateTime and then apply the system-default time-zone to convert it into a ZonedDateTime. Finally, convert the ZonedDateTime into an Instant.

Demo:

public class Main {
    public static void main(String[] args) {
        String strDateTime = "1/10/24 7:00 PM";
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("M/d/uu h:mm a", Locale.ENGLISH);
        LocalDateTime ldt = LocalDateTime.parse(strDateTime, dtf);
        ZonedDateTime zdt = ldt.atZone(ZoneId.systemDefault());
        Instant output = zdt.toInstant();
        System.out.println(output);
    }
}

Output:

2024-01-10T19:00:00Z

ONLINE DEMO

Note that you can use Instant#parse only for those strings which conform to DateTimeFormatter.ISO_INSTANT e.g. Instant.parse("2011-12-03T10:15:30Z").

Learn about the modern date-time API from Trail: Date Time

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