Ruby 2.4.0 リファレンスマニュアル > ライブラリ一覧 > 組み込みライブラリ > Timeクラス > wday

instance method Time#wday

wday -> Integer[permalink][rdoc]

曜日を0(日曜日)から6(土曜日)の整数で返します。

p sun = Time.new(2017, 9, 17, 10, 34, 15, '+09:00') # => 2017-09-17 10:34:15 +0900
p sun.wday                                          # => 0
p mon = Time.new(2017, 9, 18, 10, 34, 15, '+09:00') # => 2017-09-18 10:34:15 +0900
p mon.wday                                          # => 1
p tue = Time.new(2017, 9, 19, 10, 34, 15, '+09:00') # => 2017-09-19 10:34:15 +0900
p tue.wday                                          # => 2
p wed = Time.new(2017, 9, 20, 10, 34, 15, '+09:00') # => 2017-09-20 10:34:15 +0900
p wed.wday                                          # => 3
p thu = Time.new(2017, 9, 21, 10, 34, 15, '+09:00') # => 2017-09-21 10:34:15 +0900
p thu.wday                                          # => 4
p fri = Time.new(2017, 9, 22, 10, 34, 15, '+09:00') # => 2017-09-22 10:34:15 +0900
p fri.wday                                          # => 5
p sat = Time.new(2017, 9, 23, 10, 34, 15, '+09:00') # => 2017-09-23 10:34:15 +0900
p sat.wday                                          # => 6