getBlockNumberFromTimestamp(stamp).js

/**
* Not working itself. only shows how to get block number from timestamp for example
**/
export async function findBlockNumberFromTimestamp(timestamp) {
  invariant(timestamp <= new Date().getTime(), `timestamp: ${timestamp} should be less than or equal current timestamp`)

  const targetTimestamp = convertToTimestampSeconds(timestamp)

  const latestBlockNumber = await jsonRpcProvider.getBlockNumber()
  const latestTimestamp = await blockTimestampFetcher.fetch(latestBlockNumber) as number
  let timestampGap = targetTimestamp - latestTimestamp
  if (timestampGap === 0) {
    return latestBlockNumber
  }

  let blockGap = Math.floor(timestampGap / BSC_BLOCK_INTERVAL_SECONDS)
  let estimatedBlockNumber = latestBlockNumber + blockGap
  let estimatedBlockTimestamp = await blockTimestampFetcher.fetch(estimatedBlockNumber) as number
  while (true) {
    timestampGap = targetTimestamp - estimatedBlockTimestamp
    if (timestampGap === 0) {
      return estimatedBlockNumber
    }

    blockGap = Math.floor(timestampGap / BSC_BLOCK_INTERVAL_SECONDS)
    if (blockGap === 0) {
      let nextEstimatedBlockNumber
      let nextEstimatedBlockTimestamp
      if (timestampGap > 0) {
        while (true) {
          nextEstimatedBlockNumber = estimatedBlockNumber + 1
          nextEstimatedBlockTimestamp = await blockTimestampFetcher.fetch(nextEstimatedBlockNumber) as number
          timestampGap = targetTimestamp - nextEstimatedBlockTimestamp
          if (timestampGap < 0) {
            return estimatedBlockNumber
          }
          estimatedBlockNumber = nextEstimatedBlockNumber
        }
      } else {
        while (true) {
          nextEstimatedBlockNumber = estimatedBlockNumber - 1
          nextEstimatedBlockTimestamp = await blockTimestampFetcher.fetch(nextEstimatedBlockNumber) as number
          timestampGap = targetTimestamp - nextEstimatedBlockTimestamp
          if (timestampGap > 0) {
            return estimatedBlockNumber
          }
          estimatedBlockNumber = nextEstimatedBlockNumber
        }
      }
    }
    estimatedBlockNumber = estimatedBlockNumber + blockGap
    estimatedBlockTimestamp = await blockTimestampFetcher.fetch(estimatedBlockNumber) as number
  }
}