The appearance of Kalki
When the practices taught by the Vedas and the institutes of law, shall nearly have ceased, and the close of the Koli age shall be nigh, a portion of that Divine Being who exists of his own spiritual nature, in the character of Brahma, and who is the Beginning and the End, and who comprehends all things shall descend upon the earth. He will be born as Kalki in the family of an eminent Brahmin, of Shambhala village, endowed with the eight superhuman faculties. By his irresistible might, He will destroy all the barbarians and thieves, and all whose minds are devoted to iniquity. He will then re-establish righteousness upon earth; and the minds of those who live at the end of the Koli age, shall be awakened, and shall be as pellucid as crystal. The men who are thus changed by virtue of that peculiar time, shall be as the seeds of human beings, and shall give birth to a race who shall follow the laws of the Kritya Age, the Age of Purity.
~ Vishnu Purana 4.24
Kalki is said to born in a village called Shambhala. Some interpret this as indicating a village of the same name in the Indian state of Andhra Pradesh. I would not jump to that hasty conclusion. The name may be allegorical. Buddhist scriptures also mention a place of the same name, an invisible, hidden kingdom, which will be visible during the end of the Kali Yug. Another interesting thing is the reference to God as "who is the Beginning and the End". Compare this with 22.13 of the Revelations : I am the Alpha and the Omega, the Beginning and the End. The two religions, separated by time and space (Hinduism being much older than Christianity) are thought to have little in common. But as you read through the next few paragraphs, you shall find some amazing similarity of events mentioned in the Kalki Purana with those of the Biblical Revelations.
Afterwards, Sumati, the wife of Vishnujasha became pregnant.... Kalki descended to earth (as a human) in the month of Baisakha on the 12th day after the full moon
~ Kalki Purana, I, Verses 11 and 15
Kalki is born to a man named Vishnujasha and a woman named Sumati in the Hindu month of Baisakha, which starts from 14th or 15th April and lasts till 14th or 15th May. So, Kalki will be born 12 days from the full moon day (after 14th/15th April), which can be anytime between 26th April to 15th May. I. V.31 also says that he had three elder brothers. According to I V.32, the King of the land where Kalki is born is named Vishakhjupa. As per I V.4, the mission of Kalki's life is to destroy Koli - the equivalent of the Anti-Christ (in whose name the present age is named). Koli signifies a person as well as the vices which are peculiar to this age. As per I, V.25 Kalki was given a white horse, which he rode during his conquests all over the world. In fact Kalki is always symbolized as riding a white horse. Compare this with the Revelations :
19:11 I saw the heaven opened, and behold, a white horse, and he who sat on it is called Faithful and True. In righteousness he judges and makes war.