Time unification

inventory-server/scripts/forecast/run_forecast.js

@@ -14,6 +14,10 @@
  *   /var/www/inventory/.env (or current process env).
  */
 
+// Run in business time (see docs/TIME.md); the spawned Python engine and any
+// incidental Date math inherit it.
+process.env.TZ = process.env.TZ || 'America/Chicago';
+
 const { spawn } = require('child_process');
 const path = require('path');
 const fs = require('fs');