Wow! @blocklytics built an Ethereum blocks subgraph for pulling block numbers from timestamps, using 'time-travel queries'. 
With this subgraph you can query historical state of entities - like a user's balance or trading volume at any given block!
https://blocklytics.org/blog/ethereum-blocks-subgraph-made-for-time-travel/ …
With this subgraph you can query historical state of entities - like a user's balance or trading volume at any given block!
https://blocklytics.org/blog/ethereum-blocks-subgraph-made-for-time-travel/ …
