The Maya calendar is the Mesoamerican Maya day count that pairs 13 numbers with 20 day signs into the 260-day Tzolk'in. Here it shows which sign and number fell on your birth day, the days linked to it, and the larger era you live in.
Your birth date becomes a Julian Day Number and is tied to the Long Count with correlation 584283, which matches the calendar still kept in highland Guatemala. From it come the Tzolk'in (13 by 20, 260 days), the Haab (18 months of 20 days plus 5) and the Long Count date. All of it is whole-number arithmetic.
What it asks you for: date of birth
Your day sign and number, the Maya cross (four related days), the Moon phase and Venus on your birth day, and your k'atun, a span of about twenty years.
