JAVA - Trting to work out the number of days between two dates

Development Code
#1

My dates are LocalDates with the format YYY-MM-DD

I am trying to do it like this
long daysBetweenD = bookingDepartureIn.toEpochDay();
long daysBetweenA = bookingArrivalIn.toEpochDay();
long daysetween = daysBetweenD - daysBetweenA;
int daysetween2 = toIntExact(daysetween);

However i keep getting a run time error on the first of those lines.

Any ideas?

#2

It's abit hard to know exactly without any debugging info or any insight into the code other then those 5 lines.
But my best guess is you're trying to create a delta value from the two date values, and not the millisecond values of the two dates.
A date is not a long, or integer etc. which you can substract.
try using delta = dateObject2.getTime() - dateObject1.getTime(); i believe thats date method which returns the milliseconds since 1970 00:00:00 gmt.

#3

Are you using the built in classes for date handling?
http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
It's been a while since I've done any programming, but I think Java has everything you need built in to do this sort of thing.

also, obligitory googling

#4

convert current time to seconds since unix epoch, do the same for the other date, subtract to get the difference, convert difference to the time format you need.

#5

Worked thanks