module Whcal

# File lib/whcal.rb, line 19
def diff_day(from_date, to_date)
        diff_hour(from_date,to_date) / 24.0 
end

# File lib/whcal.rb, line 23
def diff_hour(from_date,to_date)
        diff_minute(from_date,to_date) / 60.0 
end

# File lib/whcal.rb, line 27
def diff_minute(from_date,to_date)
        diff_second(from_date,to_date) / 60.0
end

# File lib/whcal.rb, line 10
def diff_month(from_date, to_date)
        return ((((to_date.methods.include?(:year) ? to_date.year  : 0.0) - (to_date.methods.include?(:year) ? from_date.year : 0.0 )).abs.to_f*12.0 - 
                ((to_date.methods.include?(:month) ? to_date.month  : 0.0) - (to_date.methods.include?(:month) ? from_date.month : 0.0 )).abs.to_f) +
        ((to_date.methods.include?(:day) ? to_date.day  : 0.0) - (to_date.methods.include?(:day) ? from_date.day : 0.0 )).abs.to_f/30.0 + 
        ((to_date.methods.include?(:hour) ? to_date.hour  : 0.0) - (to_date.methods.include?(:hour) ? from_date.hour : 0.0 )).abs.to_f/(24*30.0) + 
        ((to_date.methods.include?(:minute) ? to_date.minute : 0.0) - (to_date.methods.include?(:minute) ? from_date.minute : 0.0 )).abs.to_f/(60*24*30.0) + 
        ((to_date.methods.include?(:second) ? to_date.second : 0.0) - (to_date.methods.include?(:second) ? from_date.second : 0.0 )).abs.to_f/(60*60*24*30.0))
end

# File lib/whcal.rb, line 31
def diff_second(from_date,to_date)
        return (( to_date.methods.include?(:day) && from_date.methods.include?(:day) ? (to_date.to_date-from_date.to_date).to_i.abs.to_f*24*60*60 : 0.0) + 
        ((to_date.methods.include?(:hour) ? to_date.hour  : 0.0) - (to_date.methods.include?(:hour) ? from_date.hour : 0.0 )).abs.to_f*60*60 +
         ((to_date.methods.include?(:minute) ? to_date.minute : 0.0) - (to_date.methods.include?(:minute) ? from_date.minute : 0.0 )).abs.to_f*60 + 
         ((to_date.methods.include?(:second) ? to_date.second : 0.0) - (to_date.methods.include?(:second) ? from_date.second : 0.0 )).abs.to_f ) 
        
end

# File lib/whcal.rb, line 6
def diff_year(from_date, to_date)
        return diff_month(from_date, to_date)/12.0 
end