Subgraph: Modified basin daily snapshot to trigger at 9 am PT/12pm EST

projects/subgraph-basin/src/utils/Well.ts

@@ -197,7 +197,9 @@ export function incrementWellWithdraw(wellAddress: Address): void {
 
 export function checkForSnapshot(wellAddress: Address, timestamp: BigInt, blockNumber: BigInt): void {
   // We check for the prior period snapshot and then take one if needed
-  let dayID = dayFromTimestamp(timestamp) - 1;
+  // Schedule the "day" to begin at 9am PT/12pm ET.
+  // Future work could include properly adjusting this when DST occurs.
+  let dayID = dayFromTimestamp(timestamp, 8 * 60 * 60) - 1;
   let hourID = hourFromTimestamp(timestamp) - 1;
 
   let well = loadWell(wellAddress);

projects/subgraph-core/utils/Dates.ts

@@ -1,7 +1,14 @@
 import { BigInt } from "@graphprotocol/graph-ts";
 
-export function dayFromTimestamp(timestamp: BigInt): i32 {
-  let day_ts = timestamp.toI32() - (timestamp.toI32() % 86400);
+/**
+ * Optionally accepts an offset, which adjusts the start of the day from UTC 00:00.
+ * @param timestamp - the timestamp to extract the day from
+ * @param offset - how much sooner the day should roll over (relative to UTC)
+ *  for example, for PST (UTC-7), an appropriate offset would be -7 * 60 * 60.
+ *  This would make the day roll over 7 hours later.
+ */
+export function dayFromTimestamp(timestamp: BigInt, offset: i32 = 0): i32 {
+  let day_ts = timestamp.toI32() + offset - ((timestamp.toI32() + offset) % 86400);
   return day_ts / 86400;
 }