In case you are interested in learning what your Mayan sign is! Go here DATE CALCULATOR and note all the information when you enter in your birthday. You'll be given a sign like, RED ELECTRIC SERPENT, or WHITE LUNAR WIZARD etc.
The first part of your sign is the colour of the "Castle" you are in either RED (east), WHITE (north), BLUE (west) or YELLOW (south). The 2nd part is the TONE of that was present on the day of your birth. The tone is all important as it effects your main glyphs meaning. There are 13 Tones (see above). The 3rd part is your main Glyph (symbol) one of 20 variations. This site is an amazing resource look up your glyph from the long list ... there is a page on each though it is slightly poetic in its descriptions