i'm not familiar with M1, but a lot people use cash app and robinhood
apps to buy bitcoin and other cryptocurrencies. i mostly use
coinbase/pro but, will likely switch between gemini (for fiat on-ramp)

https://www.bitcoinclock.com/

What is the Bitcoin Halving?

New bitcoins are issued by the Bitcoin network every 10 minutes. For the first four years of Bitcoin's existence, the amount of new bitcoins issued every 10 minutes was 50. Every four years, this number is cut in half. The day the amount halves is called a "halving".

In 2012, the amount of new bitcoins issued every 10 minutes dropped from 50 bitcoins to 25. In 2016, it dropped from 25 to 12.5. Now, in the 2020 halving, it will drop from 12.5 to 6.25.

What is the Significance of the Bitcoin Block Halving?

The halving decreases the amount of new bitcoins generated per block. This means the supply of new bitcoins is lower.

In normal markets, lower supply with steady demand usually leads to higher prices. Since the halving reduces the supply of new bitcoins, and demand usually remains steady, the halving has usually preceded some of Bitcoin's largest runs.

...

Bitcoin Halving Schedule

The Bitcoin halving is scheduled in block height, not date.

The halving happens every 210,000 blocks. The 2020 halving will happen on block 630,000. The 2024 halving will happen at block 840,000.