Type "Kalki" into any search engine and you will find birth dates, identified individuals, and countdowns. The texts behind the figure say none of that. Here is what they do say.
The source passages
The Bhagavata Purana (12.2.18–20) states that when the age has degraded so far that rulers are no better than thieves, the Lord will appear as Kalki in the home of the eminent brahmin Vishnuyasha of the village of Shambhala, mounted on a white horse and bearing a sword, to end the reign of the corrupt and begin the turn of the age. The Vishnu Purana (4.24) carries the same account in almost the same words: born in Shambhala, he will destroy the degraded and re-establish righteousness upon earth; and the minds of those who live at the end of the Kali age shall be awakened, and shall be as pellucid as crystal. The survivors of that turning become the seed of a new Satya Yuga — the cycle begins again.
What the texts do not say
No date. No name. No nationality. The village name "Shambhala" — which later Buddhist tradition developed into a hidden kingdom, and Theosophy into something else again — is in these passages simply a village. Every specific identification circulating online is a modern addition, and the tradition itself has seen claimed Kalkis come and go for centuries.
It is also worth saying plainly: by the tradition's own arithmetic, the Kali Yuga has hundreds of thousands of years left to run (see our companion piece on the timeline). A text that places its redeemer at the far end of such a span is not issuing a news bulletin; it is making a statement about the shape of time.
What the figure means
Kalki completes a pattern that runs through the whole avatar sequence: the divine descends when dharma fails (the Gita states the principle in its own voice — Gita 4.7: whenever righteousness declines and unrighteousness rises, I manifest myself). Kalki is that promise extended to the end of the age — the assertion that no darkness, however complete the twelfth canto paints it, is final. Read beside the Buddhist figure of Maitreya and the Norse rebirth after Ragnarok, it belongs to something close to a universal human insistence: endings are turnings.
Related
The Kali Yuga "predictions" · Impermanence across five traditions · The Study Hall