Age calculator

What are you most proud of, and what would you do differently next time?

New things I learnt (js):

• Add or remove HTML class using JavaScript
• Construct date(s) from user input
• Modify date(s) by setting the year, month, and day
• Comparing dates
• Calculate differences between two dates (results in milliseconds)

What challenges did you encounter, and how did you overcome them?

Had difficulty handling error when birth year is the same as current year, but the birthday haven't passed yet (should trigger error "Must be in the past") --> Solved by comparing the dates

What specific areas of your project would you like help with?

Any help is welcome!