Best Way to check if a java.util.Date is older than 30 days compared to current moment in time?

Question

Here's what I want to do:

Date currentDate = new Date();
Date eventStartDate = event.getStartDate();

How to check if eventStartDate is more than 30 days older than currentDate?

I'm using Java 8, Calendar isn't preferred.

Time zone is ZoneId.systemDefault().

Answer 1

You could try this:

Date currentDate = new Date();
Date eventStartDate = event.getStartDate();
long day30 = 30l * 24 * 60 * 60 * 1000;
boolean olderThan30 = currentDate.before(new Date((eventStartDate .getTime() + day30)));

It's disguisting, but it should do the job!

Answer 2

fun isOlderThan(interval: Int,previousTime : Long, currentTime: Long): Boolean {
    val currentDate = Date(currentTime)
    val previousDate = Date(previousTime)

    val diffCalculate = abs(currentDate.time - previousDate.time)
    val diffDays = diffCalculate / (24 * 60 * 60 * 1000)

    return diffDays > interval
}

Use

val dateFormat = SimpleDateFormat("yyy-MM-dd")
val oldDate = dateFormat.parse("2022-02-01")

if(isOlderThan(7,oldDate.time,System.currentTimeMillis()){
  Log.d("OLD CHECK","Old date is 7 days old")
}else{
  Log.d("OLD CHECK","Old day is not 7 days old")
}