Keep these points in mind about the Bitcoin halving schedule:
1) Bitcoin's block rewards are denominated in satoshis under the protocol. After repeated halvings, they will eventually reach 0, at which point no new coins will be produced.
2) Bitcoin's first halving took place on November 28, 2012, at block height 210,000, reducing the block reward from 50 coins to 25.
3) The dates shown on online halving countdowns are estimates and can shift by a few days as the actual block production rate changes.
$BTC 's halving is triggered by block height, not by a specific date on the calendar.