text: Q:
  
  How to save measured time in Rails 5?
  
  I have a js timer and I need to save the time in format: hour minute second.
  Like you know Timer.new(hour, minute, sec) (similar).
  How can i save an interval time in rails db? I just need to know how to save it, i know ho to handle ajax/controller stuff.
  
  A:
  
  You have multiple options. You can create two timestamp columns within your database like this:
  create_table "your_table", force: true do |t|
    # ...
    t.timestamp "started_at"
    t.timestamp "ended_at"
  end
  
  Or you can create one timestamp and one integer column:
  create_table "your_table", force: true do |t|
    # ...
    t.timestamp "started_at"
    t.integer  "elapsed_time"
   end
  
  Or you store only elapsed time:
  create_table "your_table", force: true do |t|
    # ...
    t.integer  "elapsed_time"
  end
  
  started_at and ended_at should be a timestamp or datetime, in my point of view. I would not only store time, because it makes calculations much more easier. For instance when started_at is today and ended_at tomorrow.
  Keep in mind that it is database dependent if Rails stores time values with a precision in seconds or microseconds.
  
  