Today I Learned

A Hashrocket project

Timex `between?` is exclusive but can be inclusive

Timex.between? is a great function for determining if a time is in a specific time period, but it’s exclusive, so if you are testing for a time at the boundary the result will be negative.

iex> end_time = Timex.now()
iex> start_time = Timex.shift(end_time, days: -7)
iex> time = start_time
iex> Timex.between?(time, start_time, end_time)
false

Never fear, you can pass an inclusive option:

iex> Timex.between?(time, start_time, end_time, inclusive: true)
true

But you don’t have to be inclusive on both sides! Here, I pass :end so that I am only inclusive at the end of my time period.

iex> Timex.between?(time, start_time, end_time, inclusive: :end)
false

And of course I can be only inclusive at the beginning of the period if I prefer:

iex> Timex.between?(time, start_time, end_time, inclusive: :start)
true
Looking for help? Elixir is quickly gaining momentum for web applications that need concurrency, performance, and the ability to connect to many different clients. The developers at Hashrocket are learning along with the rest of the development community that Elixir and Phoenix are viable Rails alternatives for the right application. Check out the source code for Today I Learned, written in Elixir, and contact us if you need help with your Elixir project.