Run your Ruby file by typing ruby and then the name of the file you want to run in the Terminal.

If we want to run date_math.rb, we can write the command:

ruby date_math.rb

To re-run this command, you can use the UP and DOWN arrow keys to look at the history of commands you've run in a Terminal.

Should format and identify different parts of todays date.

"The year is: 2020, the calendar day is: 1, and the month is: 7."

Should output the number of days since Ruby was made.

Ruby released to the public on December 21, 1995.

"Ruby is 108937 days old!"

Should output:

Is today Monday? true

if today is Monday, or

Is today Monday? false

if today is not Monday.