Java Android比较字符串格式的时间

Question

I have a String that contains a Time in the following format:

"hh:mm tt"

For Example you could represent the current time as "7:04 PM"

How can I compare this to the current time in the user's time zone to see if this time is less than, equal to, or greater than the current time?

Answer 1

You can convert String to Date .

String pattern = "<yourPattern>";
SimpleDateFormat dateFormat = new SimpleDateFormat(pattern);
try {
 Date one = dateFormat.parse(<yourDate>);
 Date two = dateFormat.parse(<yourDate>);

}
catch (ParseException e) {}

It's implements Comparable interface so you should be able to compare them with compareTo()

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Edit: I forgot but you know it but only for sure compareTo return -1, 1 or 0 so one.compareTo(two) returns -1 when first ist before second etc.

Answer 2

The following code elaborates on @Sajmon's answer.

public static void main(String[] args) throws ParseException {
    String currentTimeStr = "7:04 PM";

    Date userDate = new Date();
    String userDateWithoutTime = new SimpleDateFormat("yyyyMMdd").format(userDate);

    String currentDateStr = userDateWithoutTime + " " + currentTimeStr;
    Date currentDate = new SimpleDateFormat("yyyyMMdd h:mm a").parse(currentDateStr);

    if (userDate.compareTo(currentDate) >= 0) {
        System.out.println(userDate + " is greater than or equal to " + currentDate);
    } else {
        System.out.println(userDate + " is less than " + currentDate);
    }
}