block_by_timestamp example

docs/examples/ethers/block_by_timestamp.js

@@ -0,0 +1,25 @@
+import {ethers} from 'https://unpkg.com/ethers@5.7.2/dist/ethers.esm.js'
+
+const URL = 'https://rpc.ankr.com/eth'
+
+const provider = await ethers.getDefaultProvider(URL)
+
+const latest = await provider.getBlock('latest')
+
+async function getBlockNumberByTimestamp(timestamp, low = 0, high = latest.number) {
+  if(low + 1 == high) {
+    return low
+  } else {
+    const mid = Math.floor((low + high) / 2)
+    const midBlock = await provider.getBlock(mid)
+    if(midBlock.timestamp > timestamp) {
+      return getBlockNumberByTimestamp(timestamp, low, mid)
+    } else {
+      return getBlockNumberByTimestamp(timestamp, mid, high)
+    }
+  }
+}
+
+const timestamp = new Date('2010-08-03').getTime()/1000
+const blockNumber = await getBlockNumberByTimestamp(timestamp)
+const block = await provider.getBlock(blockNumber)