Ruby is the language I primarily use in my job as software developer. It is an object oriented, general purpose programming language that is very well suited for web development. It is dynamically typed and puts a big emphasis on code readability. I like the elegance of well written Ruby code and the powerful testing frameworks that exist for Ruby.
FIFTEEN_MINUTES = 15 * 60
t = Time.new # 2020-05-15 08:46:58.156386 +0200
rounded_time = t - t.to_i % FIFTEEN_MINUTES # 2020-05-15 08:45:00.156386 +0200