How can I calculate the day of the week of a date in ruby?
RubyDateRuby Problem Overview
How can I calculate the day of the week of a date in Ruby? For example, October 28 of 2010 is = Thursday
Ruby Solutions
Solution 1 - Ruby
I have used this because I hated to go to the Date docs to look up the strftime syntax, not finding it there and having to remember it is in the Time docs.
require 'date'
class Date
def dayname
DAYNAMES[self.wday]
end
def abbr_dayname
ABBR_DAYNAMES[self.wday]
end
end
today = Date.today
puts today.dayname
puts today.abbr_dayname
Solution 2 - Ruby
Take a look at the Date class reference. Once you have a date object, you can simply do dateObj.strftime('%A') for the full day, or dateObj.strftime('%a') for the abbreviated day. You can also use dateObj.wday for the integer value of the day of the week, and use it as you see fit.
Solution 3 - Ruby
time = Time.at(time) # Convert number of seconds into Time object.
puts time.wday # => 0: Day of week: 0 is Sunday
Solution 4 - Ruby
Date.today.strftime("%A")
=> "Wednesday"
Date.today.strftime("%A").downcase
=> "wednesday"
Solution 5 - Ruby
Quick, dirty and localization-friendly:
days = {0 => "Sunday",
1 => "Monday",
2 => "Tuesday",
3 => "Wednesday",
4 => "Thursday",
5 => "Friday",
6 => "Saturday"}
puts "It's #{days[Time.now.wday]}"
Solution 6 - Ruby
Works out of the box with ruby without requiring:
Time.now.strftime("%A").downcase #=> "thursday"
Solution 7 - Ruby
As @mway said, you can use date.strftime("%A") on any Date object to get the day of the week.
If you're lucky Date.parse might get you from String to day of the week in one go:
def weekday(date_string)
Date.parse(date_string).strftime("%A")
end
This works for your test case:
weekday("October 28 of 2010") #=> "Thursday"
Solution 8 - Ruby
Say i have date = Time.now.to_date
then date.strftime("%A") will print name for the day of the week and to have just the number for the day of the week write date.wday.
Solution 9 - Ruby
In your time object, use the property .wday to get the number that corresponds with the day of the week, e.g. If .wday returns 0, then your date is Sunday, 1 Monday, etc.
Solution 10 - Ruby
basically the same answer as Andreas
days = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday']
today_is = days[Time.now.wday]
if today_is == 'tuesday'
## ...
end