Read a timestamp — practice exercise

What you'll be asked to do

1. 1.Read a timestampexercise · easy · 10 min

   Report the type of the current timestamp.

   Passes when: #out should show number.

2. 2.Convert a date to a timestampexercise · easy · 10 min · practice plan

   Report whether the round trip keeps the value.

   Passes when: #out should show round trip works.

3. 3.Find the epoch yearexercise · easy · 10 min · practice plan

   Report the year of timestamp zero.

   Passes when: #out should show 1970.

4. 4.Convert seconds to millisecondsexercise · easy · 10 min · practice plan

   Multiply by a thousand and report the year.

   Passes when: #out should show 2026.

5. 5.Sort by timestampexercise · medium · 10 min · practice plan

   Sort the events and report their order.

   Passes when: #out should show first,second.

6. 6.Fix the seconds used directlybug fix · easy · 8 min

   JavaScript expects milliseconds, so seconds land near 1970.

   Passes when: #out should show 2026.

7. 7.Fix getTime called on the classbug fix · easy · 8 min · practice plan

   getTime belongs to a date instance, not to Date itself.

   Passes when: #out should show a number.

8. 8.Fix the events sorted by namebug fix · easy · 8 min · practice plan

   Sorting the names alphabetically ignores when they happened.

   Passes when: #out should show beta,alpha.

9. 9.Fix the 1900 offset appliedbug fix · easy · 8 min · practice plan

   getFullYear already gives the whole year, with nothing to subtract.

   Passes when: #out should show 1970.

10. 10.Fix the elapsed time measured backwardsbug fix · easy · 8 min · practice plan

    The start must be subtracted from the end.

    Passes when: #out should show not negative.

Between them these tasks cover Date.now, getTime and The epoch.

Looking for a different chapter? See every practice set, or switch to the interview theory questions.