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JavaScript Timestamps — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript Timestamps lesson. Every one is checked automatically in the browser — write the code, run it, and the tests tell you what still fails.

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Exercises(5)

  1. 1

    Read a timestamp

    easy10 min

    Report the type of the current timestamp.

  2. 2

    Convert a date to a timestamp

    easy10 min

    Report whether the round trip keeps the value.

  3. 3

    Find the epoch year

    easy10 min

    Report the year of timestamp zero.

  4. 4

    Convert seconds to milliseconds

    easy10 min

    Multiply by a thousand and report the year.

  5. 5

    Sort by timestamp

    medium10 min

    Sort the events and report their order.

Find the bug(5)

  1. 1

    Fix the seconds used directly

    easy8 min

    JavaScript expects milliseconds, so seconds land near 1970.

  2. 2

    Fix getTime called on the class

    easy8 min

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

  3. 3

    Fix the events sorted by name

    easy8 min

    Sorting the names alphabetically ignores when they happened.

  4. 4

    Fix the 1900 offset applied

    easy8 min

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

  5. 5

    Fix the elapsed time measured backwards

    easy8 min

    The start must be subtracted from the end.

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