I needed to compare two dates in SSJS and determine if a date was on or before tomorrow. Sounds pretty easy but it took me a while to figure this out. The hard part was that I needed to remove the time part, I only wanted to compare the dates.
As always (or most of the times) the solution turned out to be pretty simple and involved using the @Date() function. So if you ever need to do the same, just use the following (note that all dates are java.util.Date instances, not NotesDateTime objects).
//set an input date //for this example the date is set to June 1st, 2011 //remember: in Java(script), a month is represented by an integer from 0 to 11; //0 is January, 1 is February, and so forth; thus 11 is December var inputDate = new Date(); inputDate.setFullYear(2011, 5, 1); //set target date //you can also use @Date( @Adjust(@Now(), 0,0,1,0,0,0) ) var targetDate = @Date( @Tomorrow() ); //check if the specified date is before or on the target date var result = (@Date(inputDate).before( targetDate ) || @Date(inputDate).equals(targetDate));