# Calculate number of non-weekend days between two dates?

Discussion in 'Ruby' started by chrismo, Jan 16, 2007.

1. ### chrismoGuest

Any date/time libraries out there (I can't seem to find anything in the
std libs) that handle calculations like number of non-weekend days
between two dates, etc.?

chrismo, Jan 16, 2007

2. ### Dale MartensonGuest

chrismo wrote:
> Any date/time libraries out there (I can't seem to find anything in the
> std libs) that handle calculations like number of non-weekend days
> between two dates, etc.?

require 'date'

def weekdays(d1, d2)
count = 0
d1.upto(d2) do |date|
count += 1 if [1,2,3,4,5].include?(date.wday)
end
count
end

puts weekdays( Date.new(2006, 12, 1), Date.new(2007, 1, 16) )

A more useful twist might be to collect the weekdays and return an
array:

require 'date'

def weekdays(d1, d2)
_weekdays = []
d1.upto(d2) do |date|
_weekdays << date if [1,2,3,4,5].include?(date.wday)
end
_weekdays
end

puts weekdays( Date.new(2006, 12, 1), Date.new(2007, 1, 16) ).size

Dale Martenson, Jan 16, 2007

3. ### PhrogzGuest

Dale Martenson wrote:
> A more useful twist might be to collect the weekdays and return an
> array:

require 'date'
d1 = Date.new( 2006, 12, 1 )
d2 = Date.new( 2007, 1, 15 )

WEEKDAY_NUMBERS = [1,2,3,4,5]
weekdays = (d1..d2).select{ |d| WEEKDAY_NUMBERS.include?( d.wday ) }
p weekdays.length
#=> 32

Phrogz, Jan 16, 2007