wft_range_include.rb

a = 1                           # one
b = a - 1                       # zero
(b..a).include?(a)              #=> true
(b..a).include?(a.to_f)         #=> true
(b..a).include?(0.5)            #=> true

a = DateTime.now                # now
b = a - 1                       # 24 hours ago
(b..a).include?(a)              #=> true
(b..a).include?(a.to_date)      #=> false
(b..a).cover?(a.to_date)        #=> true
(b..a).include?(a.to_time)      #=> false
(b..a).cover?(a.to_time)        #=> false

a = Date.today                  # today
b = a - 1                       # yesterday
(b..a).include?(a)              #=> true
(b..a).include?(a.to_datetime)  #=> true
(b..a).include?(a.to_time)      #=> false (in the Western Hemisphere)

a = Time.now                    # now
b = a - 1                       # a second ago
(b..a).include?(a)              # TypeError: can't iterate from Time
(b..a).cover?(a)                #=> true
(b..a).cover?(a.to_datetime)    #=> false