These are certainly "the last days", the earth is like a woman about to give birth, but God doesn't go by the Mayan calendar!
He has his own calendar involving feast days, first laid out in Leviticus 23.
Jesus' birth, crucifixion ascension and Pentecost (the giving of the new Life) corresponded to those days... why not his return?
God points to sun darkened and moon turne dto blood as the last sign... eclipses would do this, just as it is believed there were eclipses at other significant times and from Genesis 1 God gave the heavenly bodies as signs.
In 2014-15 there will be 6 eclipses on special days... when Jesus returns his brightess will eclipse the sun.
Of couse none of us knows when our PERSONAL "last days" are so the only sensible thing is to get your eternal life now!
You need to be "born again" by receiving God's Spirit, evidenced by speaking in tongues, just like we all have ...