Bitcoin Halving Countdowns Vary Due to Block Time Estimates

Bitcoin halving is scheduled for around April 19, but different countdown calculators show slightly different estimates
The halving happens every 210,000 blocks or roughly every 4 years, pre-programmed into Bitcoin's code
Precisely predicting the timing is tricky because it depends on current block height, target block height, and average time between block mining
Average block time is estimated based on different time windows, leading to inconsistencies between calculators
As the event gets closer, small differences in block time estimates lead to bigger differences in the countdowns