Check if a date is before or after other dates

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I am using Java 7 and need to check if a date of birth is before or after certain dates.

I’m doing like this:

String  str1 ="31/12/1960";  
Date date1 = new SimpleDateFormat("dd/MM/yyyy").parse(str1);  

String  str2 ="31/12/2003";  
Date date2 = new SimpleDateFormat("dd/MM/yyyy").parse(str2); 

if (individuo.getDataNascimento() < date1 && nascimento > date2); {
addmsg ("motivo de isenção nao condiz com a idade");

}
else {
prontuario.setDataNascimento(individuo.getDataNascimento());
            log.info("Data Nascimento Indivíduo: " + prontuario.getDataNascimentoFormatado());

}

The problem is that the symbols of < and > are not recognized and it does not compile.

java date

1 answer

2

To compare whether one date comes before or after another, use the methods before and after:

if (individuo.getDataNascimento().before(date1) || individuo.getDataNascimento().after(date2)) {
   etc...
}

One detail is that I actually think you should use the operator || ("or") instead of && ("and"). For the && checks whether both conditions are true, and there is no way that a date can be at the same time before 1960 and after 2003 (either one or the other, both at the same time do not give, so if you use && will never get into this if).

Another detail is that you don’t need to create a new SimpleDateFormat all the time. If the format of the strings does not change, just reuse the same:

SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

String str1 ="31/12/1960";
Date date1 = sdf.parse(str1);

String str2 ="31/12/2003";
Date date2 = sdf.parse(str2);

An alternative to Java 7 - if you want to use an external library - is Threeten Backport, one backport of java.time (the new Java 8 Date API).

With this, you can use a more suitable type for each situation. For example, as the date of birth only has day, month and year instead of Date you can use a org.threeten.bp.LocalDate:

public class SuaClasse {
    private LocalDate dataNascimento;

    public LocalDate getDataNascimento() {
        return dataNascimento;
    }

    // etc...
}


DateTimeFormatter parser = DateTimeFormatter.ofPattern("dd/MM/uuuu");
String str1 = "31/12/1960";
LocalDate inicio = LocalDate.parse(str1, parser);

String str2 = "31/12/2003";
LocalDate fim = LocalDate.parse(str2, parser);

if (individuo.getDataNascimento().isBefore(inicio) || individuo.getDataNascimento().isAfter(fim)) {
    // data está antes de "inicio" ou depois de "fim"
}

It may seem that "only changed the date class", but the new API has many advantages and improvements compared to Date, and its use from now on would facilitate a future migration to Java 8, since changing the name of the org.threeten.bp for java.time (save one or another specific detail, see more details here and here - in particular at the end of this answer has some information about the use of backport).

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