In this it is stated that Kalki can only be the one whose Birthday/Tithi falls on Dvadasi of Sukla Paksha. This amounts to just 12 days per any given year furthermore as it can only be the day of the Lord Sri Maha Vishnu (Chaitra Dwadashi) this amounts to just one day each year or 100 days in the last century.
Indian astrologers have analysed Puranas extensively to try and foretell the time of birth of Kalki. The signs described in the Kalki Purana are as follows:
1.The moon will be in Dhanishtha nakshatra, Aquarius, suggesting he will be wealthy, acclaimed and swift in action and thought.
2.The sun will be in Swati, the nakshatra of the sword.
3.Jupiter will be in Purva Ashadha nakshatra, Sagittarius.
4.The Ascendant Lord will be in Purva Ashadha nakshatra, also Sagittarius, suggesting invincibility and early victory.
5.Saturn will be exalted in Libra, predicting a balance between justice and the sword.
6.Ketu, a five-headed snake god in navagraha, will be exalted in Scorpio, suggesting he will descend atop a great white steed.
The Puranas describe the date as twenty-one fortnights from the birth of Krishna, which itself falls on Janmashtami in August. This would put his descent at Vaishakha, between April and May. At this time, the father of Kalki is foretold to be overwhelmed by the incarnation of Godhead that he sees as his son. This places Kalki under the sun sign of Aries or Taurus.