Fix scheduling of data fetch, do it daily at 7am instead of every 24h after launching the server.

index.js

@@ -10,6 +10,28 @@ function copyItemsToSite(dataDir) {
     }
 }
 
+function scheduleFunction(hour, minute, second, func) {
+    const now = new Date();
+
+    const scheduledTime = new Date();
+    scheduledTime.setHours(hour);
+    scheduledTime.setMinutes(minute);
+    scheduledTime.setSeconds(second);
+
+    if (now > scheduledTime) {
+        scheduledTime.setDate(scheduledTime.getDate() + 1);
+    }
+    const delay = scheduledTime.getTime() - now.getTime();
+
+    console.log("Scheduling next function call: " + scheduledTime.toString());
+
+    setTimeout(async () => {
+        await func();
+        scheduleFunction(hour, minute, second, func);
+    }, delay);
+}
+
+
 (async () => {
     const dataDir = 'data';
 
@@ -26,10 +48,10 @@ function copyItemsToSite(dataDir) {
         await analysis.updateData(dataDir)
         copyItemsToSite(dataDir);
     }
-  setInterval(async () => {
+    scheduleFunction(7, 0, 0, async () => {
         items = await analysis.updateData(dataDir)
         copyItemsToSite(dataDir);
-  }, 1000 * 60 * 60 * 24);
+    });
 
     const express = require('express')
     const compression = require('compression');