Detailed explanation of the operation of string to time and time to string in Java

1. String time

In Java, you can use In the package DateTimeFormatterClass converts date and time in string format toLocalDateTimeorZonedDateTimeObject.

(I) Use predefined format

import ;
import ;

public class StringToDateExample {
    public static void main(String[] args) {
        String isoDateTime = "2023-10-11T12:34:56";
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        LocalDateTime dateTime = (isoDateTime, formatter);
        ("Date and time after parsing: " + dateTime);
    }
}

(II) Custom format

import ;
import ;

public class CustomStringToDateExample {
    public static void main(String[] args) {
        String customDateTime = "2023-10-11 12:34:56";
        DateTimeFormatter formatter = ("yyyy-MM-dd HH:mm:ss");
        LocalDateTime dateTime = (customDateTime, formatter);
        ("Date and time after parsing: " + dateTime);
    }
}

2. Time to string

Format the date and time object into a string, you can useDateTimeFormatterkind.

(I) Use predefined format

import ;
import ;

public class DateToStringExample {
    public static void main(String[] args) {
        LocalDateTime now = ();
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        String formattedDate = (formatter);
        ("ISO format date and time: " + formattedDate);
    }
}

(II) Custom format

import ;
import ;

public class CustomDateToStringExample {
    public static void main(String[] args) {
        LocalDateTime now = ();
        DateTimeFormatter formatter = ("yyyy-MM-dd HH:mm:ss");
        String formattedDate = (formatter);
        ("Custom format date and time: " + formattedDate);
    }
}

3. Process dates in different time zones

You can use when processing dates in different time zonesZonedDateTimekind.

(I) Date and time of string to use time zone

import ;
import ;

public class StringToZonedDateTimeExample {
    public static void main(String[] args) {
        String zonedDateTimeString = "2023-10-11T12:34:56-04:00";
        DateTimeFormatter formatter = DateTimeFormatter.ISO_ZONED_DATE_TIME;
        ZonedDateTime zonedDateTime = (zonedDateTimeString, formatter);
        ("Resolved Date and Time with Time Zone: " + zonedDateTime);
    }
}

(II) Date and time to string with time zone

import ;
import ;

public class ZonedDateTimeToStringExample {
    public static void main(String[] args) {
        ZonedDateTime now = ();
        DateTimeFormatter formatter = ("yyyy-MM-dd HH:mm:ss z");
        String formattedDate = (formatter);
        ("Date time string with time zone: " + formattedDate);
    }
}

4. Summary

Java'sThe package provides powerful date and time processing functions throughDateTimeFormatterIt is easy to convert between a datetime object and a string.

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