CODEWITHSUNDEEP
rubydate
Panagiotis Panagi
Panagiotis Panagi

Reputation: 10087

Ruby code to get the date of next Monday (or any day of the week)

Given an input of, for example,

day = 'Monday'

how can I calculate the date of the next day?

def date_of_next(day)
  ...
end

Upvotes: 57

Views: 31970

Answers (8)

Jack
Jack

Reputation: 5434

I know this is a Ruby question, but I think many people using Rails are gonna find this. Many answers use Date.today, which is server time and is usually not a good idea to use if you're on Rails. Recommended to incorporate user's time zone:

DateTime.now.in_time_zone(my_user.time_zone).next_occurring(:monday)

Upvotes: 0

panteo
panteo

Reputation: 730

Rails >= 5.2.3

Date.current.next_occurring(:monday)

https://api.rubyonrails.org/classes/DateAndTime/Calculations.html#method-i-next_occurring

Upvotes: 18

Milo P
Milo P

Reputation: 1462

A Rails 4-compatible solution:

(Date.today + 1.week).beginning_of_week(:monday)

where you can provide the day you'd like to find as a symbol argument; the default is :monday.

Note that this will find the next occurrence of the given day - if today is Monday and you're looking for the next Monday, it will return the Monday one week from today.

Some equivalent ways to do it:

1.week.from_now.beginning_of_week(:monday).to_date

1.week.since(Date.today).beginning_of_week(:monday)

(source: https://apidock.com/rails/Date/beginning_of_week/class)

Upvotes: 5

s_dolan
s_dolan

Reputation: 1276

For anyone like me who came here looking for a solution in Rails to this problem, as of Rails 5.2 there is a much easier method to do this.

For anyone (like the original poster) not specifically using Rails, this functionality is available in the ActiveSupport gem.

To find the next occurring day of a week, we can simply write something like Date.today.next_occurring(:friday).

See the documentation for more details.

Upvotes: 55

Hannu
Hannu

Reputation: 151

If you are using rails you can use Date.today.sunday for Sunday or Date.today.monday for Monday. And then Date.today.sunday - 1.day for Saturday etc.

Upvotes: 14

Devin Brown
Devin Brown

Reputation: 1131

I know this is an old post, but I came up with a couple of methods to quickly get the previous and next day of the week.

# date is a Date object and day_of_week is 0 to 6 for Sunday to Saturday

require 'Date'

def get_next_day(date, day_of_week)
  date + ((day_of_week - date.wday) % 7)
end

def get_previous_day(date, day_of_week)
  date - ((date.wday - day_of_week) % 7)
end

puts today = Date.today
# 2015-02-24

puts next_friday = get_next_day(today, 5)
# 2015-02-27

puts last_friday = get_previous_day(today, 5)
# 2015-02-20

Upvotes: 24

Dave Newton
Dave Newton

Reputation: 160321

For stuff like this I rely on the chronic library.

The Ruby code would be:

def date_of_next(day)
    Chronic.parse("next #{day}")
end

Upvotes: 14

fl00r
fl00r

Reputation: 83680

require 'date'

def date_of_next(day)
  date  = Date.parse(day)
  delta = date > Date.today ? 0 : 7
  date + delta
end

Date.today
#=>#<Date: 2011-10-28 (4911725/2,0,2299161)>
date_of_next "Monday"
#=>#<Date: 2011-10-31 (4911731/2,0,2299161)>
date_of_next "Sunday"
#=>#<Date: 2011-10-30 (4911729/2,0,2299161)>

Upvotes: 106

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