Parsing HTML date input into Timestamp in Java Servlet

Question

Recently I'm having a problem with Timestamp and HTML input type Date:

This is my HTML/JSP:

<div class="form-group">
   <label>Your day of birth</label>
   <input class="form-control form-control-lg" type="date" name="txtBirthdate" required="">
</div>

This is my Java Servlet:

String birth = request.getParameter(Constants.BIRTHDATE_TXT);
System.out.println(birth);
Timestamp bDate = new Timestamp(((new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(birth)).getTime()));
System.out.println(bDate);
Timestamp joinDate = new Timestamp(Calendar.getInstance().getTime().getTime());

I cannot parsing the String birth into Timestamp, are there any ways for converting it? And also am I right when you pare the yyyy-MM-dd string using the SimpleDateFormat, it will set the HH:mm:ss part with default value is 00:00:0000?

Thank you for your help

I recommend you neither use Timestamp, SimpleDateFormat nor Calendar. All of those classes are poorly designed and long outdated, SimpleDateFormat in particular notoriously troublesome. Instead use for example LocalDateTime and DateTimeFormatter, both from java.time, the modern Java date and time API. — Anonymous
– Anonymous, Commented Dec 28, 2020 at 6:00
We are missing some information here: What is an example of the string you are trying to parse? What error message are you getting? Or which incorrect result? And what were you thinking that you needed a Timestamp for? — Anonymous
– Anonymous, Commented Dec 28, 2020 at 6:02
Were you serious about the jodatime tag? Did you want to use Joda-Time? — Anonymous
– Anonymous, Commented Dec 28, 2020 at 8:04
@OleV.V. Thank you for your suggestion. My problem is I don't really know how to parse date like example: "2020-12-28" into Timestamp. I'll try to use LocalDateTime for this. — Jason
– Jason, Commented Dec 28, 2020 at 8:35
Use LocalDate, LocalDate.parse("2020-12-28") works without any formatter. And as I said, you most probably neither want nor need Timestamp. What exactly you do need instead, I don’t know since it depends on circumstances you haven’t yet told us. — Anonymous
– Anonymous, Commented Dec 28, 2020 at 9:20

Arvind Kumar Avinash · Accepted Answer · 2020-12-28 11:37:47Z

The date-time API of java.util and their formatting API, SimpleDateFormat are outdated and error-prone. Note that java.sql.Timestamp has inherited the same drawbacks as it extends java.util.Date. It is recommended to stop using them completely and switch to the modern date-time API. For any reason, if you have to stick to Java 6 or Java 7, you can use ThreeTen-Backport which backports most of the java.time functionality to Java 6 & 7. If you are working for an Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring and How to use ThreeTenABP in Android Project.

You have mentioned,

My problem is I don't really know how to parse date like example: "2020-12-28" into Timestamp

You have also mentioned,

And also am I right when you pare the yyyy-MM-dd string using the SimpleDateFormat, it will set the HH:mm:ss part with default value is 00:00:0000?

From these two requirements, I infer that you need a date e.g. 2020-12-28 combined with the time e.g. 00:00:00 which is nothing but the start of the day. java.time provides a clean API, LocalDate#atStartOfDay to achieve this.

Demo:

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String strDate = "2020-12-28";

        // Parse the given date string into LocalDate. Note that you do not need a
        // DateTimeFormatter to parse it as it is already in ISO 8601 format
        LocalDate date = LocalDate.parse(strDate);

        // Note: In the following line, replace ZoneId.systemDefault() with the required
        // Zone ID which specified in the format, Continent/City e.g.
        // ZoneId.of("Europe/London")
        ZonedDateTime zdt = date.atStartOfDay(ZoneId.systemDefault());

        // Print the default format i.e. the value of zdt#toString. Note that the
        // default format omits seconds and next smaller units if seconds part is zero
        System.out.println(zdt);

        // Get and print just the date-time without timezone information
        LocalDateTime ldt = zdt.toLocalDateTime();
        System.out.println(ldt);

        // Get and print zdt in a custom format
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSS", Locale.ENGLISH);
        String formatted = zdt.format(dtf);
        System.out.println(formatted);
    }
}

Output:

2020-12-28T00:00Z[Europe/London]
2020-12-28T00:00
2020-12-28T00:00:00.000

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

Collectives™ on Stack Overflow

Parsing HTML date input into Timestamp in Java Servlet

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related