How does google calculate time

Question

I'm working on a java program that calculates a given amount of seconds to the amount of years, days, hours, all the way to plancks. I can enter in the google search bar "31 years, 259 days, 5 hours, 54 minutes" and i'll get a result stating "31.7097916 years." How does it calculate this? I'd like to implement this into my program if possible.

Answer 1

Just do the math, for 31 years, 259 days, 5 hours, 54 minutes

float total = 31f;

// Days to years
total = 259 / 365;

// Hours to years
total = total + ((5 / 24) / 365);

// Minutes to years
total = total + (((54 / 60) / 24) / 365);

System.out.println("Total = " + total);

As you can see, there is a logic to this. For a more complex (but still very simple) implementation

public float daysToYear(int days){
    return days / 365;
}

public float hoursToYear(int hours){
    return (hours / 24) / 365;
}

public float minsToYear(int mins){
    return ((min / 60) / 24) / 365;
}

public float secsToYear(int secs){
    return (((secs / 60) / 60) / 24) / 365;
}

public float millisToYear(int millis){
    return ((((millis / 1000) / 60) / 60) / 24) / 365;
}

As you can see, these conversions themselves can be simplified and modified to fit anything you would need; for example you could simplify millisToYear() to

public float millisToYear(double millis){
    return secsToYear(millis/1000);
}

Notice the change of parameter type to double from int. Of course, as mentioned in the comments below, if you want more complexity implemented (time zones, leap year, etc.) then you need to take those into consideration. Again, simple logic. If you need help comment and I will improve my answer, if you are super nice about it :P