Check if date is older than 10 years and newer than 20 years

Question

I am trying to check in Java 8 if a date is older than 10 years and newer than 20 years. I am using Date.before() And Date.after() and passing currentDate-10 years and currentDate-20 years as arguments.

Can someone please suggest what will the cleanest way to get a date which is 10 year old and 20 years old in Date format to pass it in my before() and after() methods?

Answer 1

You can use java.time.LocalDate to do this. Example: If you need to check if 01/01/2005 is between that duration, you can use

LocalDate date = LocalDate.of(2005, 1, 1); // Assign date to check LocalDate today = LocalDate.now();  if (date.isBefore(today.minusYears(10)) && date.isAfter(today.minusYears(20))) {   //Do Something } 

Answer 2

Using Calendar you can easily get a 10 year old date and 20 year old date from the current date.

Calendar calendar  = Calendar.getInstance(); calendar.add(Calendar.YEAR, -10); Date d1 = calendar.getTime(); calendar.add(Calendar.YEAR, -10); Date d2 = calendar.getTime(); 

As you are using Java 8 you can also use LocalDate

    LocalDate currentDate = LocalDate.now();     Date d1 = Date.from(currentDate.minusYears(10).atStartOfDay(ZoneId.systemDefault()).toInstant());     Date d2 = Date.from(currentDate.minusYears(20).atStartOfDay(ZoneId.systemDefault()).toInstant()); 

For comparing you can use the date.after() and date.before() methods as you said.

    if(date.after(d1) && date.before(d2)){  //date is the Date instance that wants to be compared         ////     } 

The before() and after() methods are implemented in Calendar and LocalDate too. You can use those methods in those instances without converting into java.util.Date instances.