Knows about workdays and holidays, public and otherwise. Answers the age-old question When is mothersday this year?.

Build Status


Add this line to your application's Gemfile:

gem 'timetress'

And then execute:

$ bundle

Or install it yourself as:

$ gem install timetress


Timetress knows about holidays

Timetress.christmas 2012
=> #<Date: 2012-12-25>
# On New Year's Eve, 2011
=> #<Date: 2012-12-25>
# On Christmas Day, 2012
=> #<Date: 2011-12-25>

Public Holidays (Norway only)

A public holiday, national holiday or legal holiday is a holiday generally established by law and is usually a non-working day during the year.

  • Wikipedia

Timetress::Norway.public_holidays(2012) => [#, #,...]


A workday is a day of the week which is neither a weekend, nor a public holiday.

Timetress::Norway.workday? Date.new(2012, 1, 5)
 => true

Timetress::Norway.workday? Date.new(2012, 5, 17)
 => false

In calculating deadlines and lead time, it's often helpful to count workdays:

Timetress::Norway.nth_workday_before 4, Date.new(2012, 10, 25)
 => #<Date: 2012-10-19>

Timetress::Norway.nth_workday_after 1, Date.new(2012, 10, 25)
 => #<Date: 2012-10-26>

Implemented holidays (Norway)

Public holidays are emphasized below.

  • New Year's Day: January 1st.
  • Mothersday: Second Sunday in February.
  • Valentines Day: February 14.
  • Labour Day: May 1.
  • National Holiday: May 17.
  • Maundy Thursday: The Thursday before Easter Sunday.
  • Good Friday: The Friday before Easter Sunday.
  • Easter Sunday: Don't ask. It's crazy.
  • Easter Monday: The day after Easter Sunday.
  • Ascension: The Thursday which is the 40th day after Easter.
  • Pentecost Sunday: The Sunday which is the 50th day after Easter.
  • Pentecost Monday: The Sunday which is the 51st day after Easter.
  • Fathersday: Second Sunday in November.
  • Christmas Eve: December 24th.
  • Christmas: December 25th.
  • Boxing Day: December 26th.


The cycle of Easter dates repeats after exactly 5,700,000 years, with April 19 being the most common date.


The current implementation simply has a list of 200 years worth of easter.


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request