Question

I’ve been a bit spoiled by the joda-time API of:

DateTime now = new DateTime();
DateTime ninetyDaysAgo = now.minusDays(90);

I’m trying to do a similar thing in Ruby, but I’m

now = Time.now
ninetyDaysAgo = now - (90*24)

However, the math is off here (I’m really working with dates at midnight).

Is there friendly API for date subtraction?

Answer 1

require 'date'
now = Date.today
ninety_days_ago = (now - 90)

Running this thru the IRB console I get:

>>require 'date'
now = Date.today
ninety_days_ago = (now - 90)

require 'date'
=> false
now = Date.today
=> #<Date: 2011-03-02 (4911245/2,0,2299161)>
ninety_days_ago = (now - 90)
=> #<Date: 2010-12-02 (4911065/2,0,2299161)>

If you need the time you could just say now = DateTime.now