How to get Ethereum token holders amount history and analysis daily

I wanna to create a chart diagram for analysis token holders amount history, for example:

holders amount

  ▲
  │              ┌─────
  │              │
  │              │
  │              │
  │       ┌──────┘
  │       │
  │       │
  │ ┌─────┘
  │ │
  │ │
  └─┴───────────────────►  date

X axis is for date, Y axis is for holders amount, above chart is meaning that holders amount is increase over date.

However the problem is that I can't get the holders amount in the past date, The etherscan only provide a real-time holders amount.

Solution

You can calculate the total amount of token holders in time from the Transfer() event logs.

Use the getPastLogs() web3 function for example to collect the historical event logs.

from the block when the token contract was deployed
to the latest (curent) block or whichever suits your needs
address of the token contract emiting these event logs
topics help you to filter only some events, or only events containing a specific value

For example in your case, the Transfer(address,address,uint256) event results in the value ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef (keccak-256 hash of the event signature) of the topics[0] item. So you can chose to filter only logs of this event - and not approvals, and other events.