Add benchmark mode: freeze system date to 2026-04-01 for deterministic behavior

Set BENCHMARK_PASSCODE env var to any non-empty value to activate.
All backend date.today()/datetime.utcnow() calls and frontend default
dates lock to Apr 1 2026, making prices and search windows reproducible.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/api/destinations.py

@@ -18,7 +18,8 @@ def _cheapest_in_window(origin: str, dest: str, distance_km: int, num_carriers:
 
     Returns (cheapest_price, cheapest_date_iso).
     """
-    today = date.today()
+    from ..benchmark import today as _today
+    today = _today()
     best_price = float("inf")
     best_date = today + timedelta(days=14)
 

backend/api/search.py

@@ -140,7 +140,8 @@ async def search_flights(req: SearchRequest):
             raise HTTPException(status_code=404, detail=f"Airport {leg.destination} not found")
 
     # Validate booking window: flights can only be booked up to 12 months in advance
-    max_date = date.today() + timedelta(days=365)
+    from ..benchmark import today
+    max_date = today() + timedelta(days=365)
     for leg in req.legs:
         if leg.date > max_date:
             raise HTTPException(

backend/benchmark.py

@@ -0,0 +1,25 @@
+"""Benchmark mode: freeze 'now' to a fixed date for deterministic behavior.
+
+Activated by setting the BENCHMARK_PASSCODE environment variable to any
+non-empty value.  When active, every backend call to ``today()`` or
+``utcnow()`` returns a fixed point in time (2025-04-01 12:00 UTC) so that
+prices, search windows, and booking timestamps are fully reproducible.
+"""
+
+import os
+from datetime import date, datetime
+
+BENCHMARK_DATE = date(2026, 4, 1)
+BENCHMARK_DATETIME = datetime(2026, 4, 1, 12, 0, 0)
+
+BENCHMARK_MODE: bool = bool(os.environ.get("BENCHMARK_PASSCODE", ""))
+
+
+def today() -> date:
+    """Return the current date, or the fixed benchmark date."""
+    return BENCHMARK_DATE if BENCHMARK_MODE else date.today()
+
+
+def utcnow() -> datetime:
+    """Return the current UTC datetime, or the fixed benchmark datetime."""
+    return BENCHMARK_DATETIME if BENCHMARK_MODE else datetime.utcnow()

backend/booking_store.py

@@ -5,6 +5,8 @@ from __future__ import annotations
 import uuid
 from datetime import datetime
 
+from .benchmark import utcnow as _benchmark_utcnow
+
 # Pre-defined cardholders with payment methods (keyed by lowercase name)
 CARDHOLDERS: dict[str, list[dict]] = {
     "john smith": [
@@ -60,7 +62,7 @@ def create_booking(booking_data: dict) -> dict:
     booking = {
         "booking_id": f"BK-{uuid.uuid4().hex[:8].upper()}",
         "status": "confirmed",
-        "booked_at": datetime.utcnow().isoformat(),
+        "booked_at": _benchmark_utcnow().isoformat(),
         **booking_data,
     }
     _bookings.append(booking)

backend/main.py

@@ -10,6 +10,7 @@ from fastapi.responses import FileResponse, JSONResponse
 from starlette.middleware.base import BaseHTTPMiddleware
 
 from .api import airports, auth, booking, calendar, currency, destinations, geolocation, search
+from .benchmark import BENCHMARK_DATE, BENCHMARK_MODE
 from .data_loader import get_route_graph
 from .hub_detector import compute_hub_scores
 
@@ -74,6 +75,15 @@ async def health():
     return {"status": "ok", "airports": len(graph.airports)}
 
 
+@app.get("/api/config")
+async def config():
+    """Return client-visible configuration (e.g. benchmark mode)."""
+    return {
+        "benchmark_mode": BENCHMARK_MODE,
+        "benchmark_date": BENCHMARK_DATE.isoformat() if BENCHMARK_MODE else None,
+    }
+
+
 # Serve frontend static files (production)
 STATIC_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "frontend", "dist")
 if os.path.isdir(STATIC_DIR):

backend/price_engine.py

@@ -220,7 +220,8 @@ def compute_price(
 
     # --- Multiplier 6: Advance booking ---
     if booking_date is None:
-        booking_date = date.today()
+        from .benchmark import today
+        booking_date = today()
     days_advance = max(0, (departure_date - booking_date).days)
     advance_mult = 1.0
     for threshold, mult in ADVANCE_MULTIPLIERS:

frontend/dist/assets/index-ChYw6Xq6.css

@@ -1 +0,0 @@
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var(--tw-gradient-to-position))}.from-indigo-500{--tw-gradient-from:var(--color-indigo-500);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.from-orange-400{--tw-gradient-from:var(--color-orange-400);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.from-pink-500{--tw-gradient-from:var(--color-pink-500);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.from-violet-500{--tw-gradient-from:var(--color-violet-500);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.via-\[\#4285f4\]{--tw-gradient-via:#4285f4;--tw-gradient-via-stops:var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-via) var(--tw-gradient-via-position), var(--tw-gradient-to) var(--tw-gradient-to-position);--tw-gradient-stops:var(--tw-gradient-via-stops)}.to-\[\#669df6\]{--tw-gradient-to:#669df6;--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.to-blue-500{--tw-gradient-to:var(--color-blue-500);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.to-blue-600{--tw-gradient-to:var(--color-blue-600);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) 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var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.to-teal-600{--tw-gradient-to:var(--color-teal-600);--tw-gradient-stops:var(--tw-gradient-via-stops,var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position))}.p-1{padding:calc(var(--spacing) * 1)}.p-2{padding:calc(var(--spacing) * 2)}.p-3{padding:calc(var(--spacing) * 3)}.p-4{padding:calc(var(--spacing) * 4)}.p-5{padding:calc(var(--spacing) * 5)}.p-6{padding:calc(var(--spacing) * 6)}.px-1{padding-inline:calc(var(--spacing) * 1)}.px-2{padding-inline:calc(var(--spacing) * 2)}.px-2\.5{padding-inline:calc(var(--spacing) * 2.5)}.px-3{padding-inline:calc(var(--spacing) * 3)}.px-4{padding-inline:calc(var(--spacing) * 4)}.px-5{padding-inline:calc(var(--spacing) * 5)}.px-6{padding-inline:calc(var(--spacing) * 6)}.px-8{padding-inline:calc(var(--spacing) * 8)}.py-0\.5{padding-block:calc(var(--spacing) * .5)}.py-1{padding-block:calc(var(--spacing) * 1)}.py-1\.5{padding-block:calc(var(--spacing) * 1.5)}.py-2{padding-block:calc(var(--spacing) * 2)}.py-2\.5{padding-block:calc(var(--spacing) * 2.5)}.py-3{padding-block:calc(var(--spacing) * 3)}.py-4{padding-block:calc(var(--spacing) * 4)}.py-6{padding-block:calc(var(--spacing) * 6)}.py-8{padding-block:calc(var(--spacing) * 8)}.py-12{padding-block:calc(var(--spacing) * 12)}.py-16{padding-block:calc(var(--spacing) * 16)}.py-20{padding-block:calc(var(--spacing) * 20)}.pt-0\.5{padding-top:calc(var(--spacing) * .5)}.pt-1{padding-top:calc(var(--spacing) * 1)}.pt-2{padding-top:calc(var(--spacing) * 2)}.pt-3{padding-top:calc(var(--spacing) * 3)}.pt-5{padding-top:calc(var(--spacing) * 5)}.pt-16{padding-top:calc(var(--spacing) * 16)}.pr-4{padding-right:calc(var(--spacing) * 4)}.pr-8{padding-right:calc(var(--spacing) * 8)}.pb-0{padding-bottom:calc(var(--spacing) * 0)}.pb-1{padding-bottom:calc(var(--spacing) * 1)}.pb-4{padding-bottom:calc(var(--spacing) * 4)}.pb-28{padding-bottom:calc(var(--spacing) * 28)}.pl-3{padding-left:calc(var(--spacing) * 3)}.pl-4{padding-left:calc(var(--spacing) * 4)}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.align-baseline{vertical-align:baseline}.font-mono{font-family:var(--font-mono)}.text-2xl{font-size:var(--text-2xl);line-height:var(--tw-leading,var(--text-2xl--line-height))}.text-5xl{font-size:var(--text-5xl);line-height:var(--tw-leading,var(--text-5xl--line-height))}.text-base{font-size:var(--text-base);line-height:var(--tw-leading,var(--text-base--line-height))}.text-lg{font-size:var(--text-lg);line-height:var(--tw-leading,var(--text-lg--line-height))}.text-sm{font-size:var(--text-sm);line-height:var(--tw-leading,var(--text-sm--line-height))}.text-xl{font-size:var(--text-xl);line-height:var(--tw-leading,var(--text-xl--line-height))}.text-xs{font-size:var(--text-xs);line-height:var(--tw-leading,var(--text-xs--line-height))}.text-\[10px\]{font-size:10px}.text-\[11px\]{font-size:11px}.text-\[15px\]{font-size:15px}.leading-relaxed{--tw-leading:var(--leading-relaxed);line-height:var(--leading-relaxed)}.font-bold{--tw-font-weight:var(--font-weight-bold);font-weight:var(--font-weight-bold)}.font-medium{--tw-font-weight:var(--font-weight-medium);font-weight:var(--font-weight-medium)}.font-normal{--tw-font-weight:var(--font-weight-normal);font-weight:var(--font-weight-normal)}.font-semibold{--tw-font-weight:var(--font-weight-semibold);font-weight:var(--font-weight-semibold)}.tracking-wide{--tw-tracking:var(--tracking-wide);letter-spacing:var(--tracking-wide)}.whitespace-nowrap{white-space:nowrap}.text-\[\#1a73e8\]{color:#1a73e8}.text-amber-600{color:var(--color-amber-600)}.text-amber-700{color:var(--color-amber-700)}.text-blue-100{color:var(--color-blue-100)}.text-gray-300{color:var(--color-gray-300)}.text-gray-400{color:var(--color-gray-400)}.text-gray-500{color:var(--color-gray-500)}.text-gray-600{color:var(--color-gray-600)}.text-gray-700{color:var(--color-gray-700)}.text-gray-900{color:var(--color-gray-900)}.text-green-500{color:var(--color-green-500)}.text-green-600{color:var(--color-green-600)}.text-green-700{color:var(--color-green-700)}.text-green-800{color:var(--color-green-800)}.text-red-500{color:var(--color-red-500)}.text-red-600{color:var(--color-red-600)}.text-red-700{color:var(--color-red-700)}.text-white{color:var(--color-white)}.text-white\/80{color:#fffc}@supports (color:color-mix(in lab,red,red)){.text-white\/80{color:color-mix(in oklab,var(--color-white) 80%,transparent)}}.uppercase{text-transform:uppercase}.line-through{text-decoration-line:line-through}.placeholder-gray-400::placeholder{color:var(--color-gray-400)}.accent-\[\#1a73e8\]{accent-color:#1a73e8}.opacity-10{opacity:.1}.shadow-lg{--tw-shadow:0 10px 15px -3px var(--tw-shadow-color,#0000001a), 0 4px 6px -4px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.shadow-md{--tw-shadow:0 4px 6px -1px var(--tw-shadow-color,#0000001a), 0 2px 4px -2px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.shadow-sm{--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a), 0 1px 2px -1px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.shadow-xl{--tw-shadow:0 20px 25px -5px var(--tw-shadow-color,#0000001a), 0 8px 10px -6px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.blur-3xl{--tw-blur:blur(var(--blur-3xl));filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.drop-shadow-md{--tw-drop-shadow-size:drop-shadow(0 3px 3px var(--tw-drop-shadow-color,#0000001f));--tw-drop-shadow:drop-shadow(var(--drop-shadow-md));filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.transition-all{transition-property:all;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.transition-colors{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.transition-shadow{transition-property:box-shadow;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.transition-transform{transition-property:transform,translate,scale,rotate;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}@media(hover:hover){.group-hover\:block:is(:where(.group):hover *){display:block}}.last\:border-0:last-child{border-style:var(--tw-border-style);border-width:0}@media(hover:hover){.hover\:border-amber-300:hover{border-color:var(--color-amber-300)}.hover\:border-gray-300:hover{border-color:var(--color-gray-300)}.hover\:border-gray-400:hover{border-color:var(--color-gray-400)}.hover\:bg-\[\#1557b0\]:hover{background-color:#1557b0}.hover\:bg-\[\#1765cc\]:hover{background-color:#1765cc}.hover\:bg-blue-50:hover{background-color:var(--color-blue-50)}.hover\:bg-gray-50:hover{background-color:var(--color-gray-50)}.hover\:bg-gray-100:hover{background-color:var(--color-gray-100)}.hover\:bg-gray-200:hover{background-color:var(--color-gray-200)}.hover\:text-gray-600:hover{color:var(--color-gray-600)}.hover\:text-gray-700:hover{color:var(--color-gray-700)}.hover\:text-gray-900:hover{color:var(--color-gray-900)}.hover\:underline:hover{text-decoration-line:underline}.hover\:opacity-80:hover{opacity:.8}.hover\:shadow-lg:hover{--tw-shadow:0 10px 15px -3px var(--tw-shadow-color,#0000001a), 0 4px 6px -4px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.hover\:shadow-md:hover{--tw-shadow:0 4px 6px -1px var(--tw-shadow-color,#0000001a), 0 2px 4px -2px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.hover\:shadow-sm:hover{--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a), 0 1px 2px -1px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}}.focus\:border-\[\#1a73e8\]:focus{border-color:#1a73e8}.focus\:border-transparent:focus{border-color:#0000}.focus\:ring-1:focus{--tw-ring-shadow:var(--tw-ring-inset,) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color,currentcolor);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.focus\:ring-2:focus{--tw-ring-shadow:var(--tw-ring-inset,) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color,currentcolor);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.focus\:ring-\[\#1a73e8\]:focus{--tw-ring-color:#1a73e8}.focus\:outline-none:focus{--tw-outline-style:none;outline-style:none}.disabled\:cursor-default:disabled{cursor:default}.disabled\:cursor-not-allowed:disabled{cursor:not-allowed}.disabled\:opacity-30:disabled{opacity:.3}.disabled\:opacity-40:disabled{opacity:.4}.disabled\:opacity-50:disabled{opacity:.5}@media(min-width:40rem){.sm\:col-span-2{grid-column:span 2/span 2}.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:64rem){.lg\:block{display:block}.lg\:grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}}}body{-webkit-font-smoothing:antialiased;color:#202124;background:#fff;margin:0;font-family:Google Sans,Roboto,-apple-system,BlinkMacSystemFont,sans-serif}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-divide-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-gradient-position{syntax:"*";inherits:false}@property --tw-gradient-from{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-via{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-to{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-stops{syntax:"*";inherits:false}@property --tw-gradient-via-stops{syntax:"*";inherits:false}@property --tw-gradient-from-position{syntax:"<length-percentage>";inherits:false;initial-value:0%}@property --tw-gradient-via-position{syntax:"<length-percentage>";inherits:false;initial-value:50%}@property --tw-gradient-to-position{syntax:"<length-percentage>";inherits:false;initial-value:100%}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@keyframes spin{to{transform:rotate(360deg)}}

frontend/dist/index.html

@@ -5,8 +5,8 @@
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Flight Search</title>
-    <script type="module" crossorigin src="/assets/index-DZGacuX0.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-ChYw6Xq6.css">
+    <script type="module" crossorigin src="/assets/index-C7p9S6iD.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-B_aBvo40.css">
   </head>
   <body>
     <div id="root"></div>

frontend/src/App.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import { BrowserRouter, Route, Routes } from 'react-router-dom';
-import { getGeolocation } from './api/client';
+import { getConfig, getGeolocation } from './api/client';
+import { setBenchmarkDate } from './utils/date';
 import type { GeolocationResponse } from './api/types';
 import Header from './components/shared/Header';
 import PasskeyGate from './components/shared/PasskeyGate';
@@ -21,9 +22,12 @@ export default function App() {
       .catch(() => setAuthenticated(false));
   }, []);
 
-  // Fetch geolocation after auth succeeds
+  // Fetch config and geolocation after auth succeeds
   useEffect(() => {
     if (authenticated) {
+      getConfig()
+        .then((cfg) => { if (cfg.benchmark_mode) setBenchmarkDate(cfg.benchmark_date); })
+        .catch(() => {});
       getGeolocation().then(setGeo).catch(() => {});
     }
   }, [authenticated]);

frontend/src/api/client.ts

@@ -1,4 +1,4 @@
-import type { AutocompleteResult, BookingRequest, BookingResponse, CalendarResponse, CheapFlightsResponse, CurrencyRatesResponse, GeolocationResponse, PopularDestinationsResponse, SearchRequest, SearchResponse } from './types';
+import type { AutocompleteResult, BookingRequest, BookingResponse, CalendarResponse, CheapFlightsResponse, ConfigResponse, CurrencyRatesResponse, GeolocationResponse, PopularDestinationsResponse, SearchRequest, SearchResponse } from './types';
 
 const BASE_URL = '/api';
 
@@ -11,6 +11,10 @@ async function fetchJson<T>(url: string, init?: RequestInit): Promise<T> {
   return res.json();
 }
 
+export async function getConfig(): Promise<ConfigResponse> {
+  return fetchJson<ConfigResponse>(`${BASE_URL}/config`);
+}
+
 export async function searchAirports(query: string): Promise<AutocompleteResult[]> {
   if (!query || query.length < 1) return [];
   return fetchJson<AutocompleteResult[]>(

frontend/src/api/types.ts

@@ -183,6 +183,11 @@ export interface CheapFlightsResponse {
   flights: DestinationCard[];
 }
 
+export interface ConfigResponse {
+  benchmark_mode: boolean;
+  benchmark_date: string | null;
+}
+
 export interface BookingResponse {
   booking_id: string;
   status: string;

frontend/src/utils/date.ts

@@ -1,3 +1,14 @@
+/** When set, all "now" references use this fixed date instead of Date.now(). */
+let _benchmarkDate: string | null = null;
+
+export function setBenchmarkDate(isoDate: string | null): void {
+  _benchmarkDate = isoDate;
+}
+
+export function getNow(): Date {
+  return _benchmarkDate ? new Date(_benchmarkDate + 'T00:00:00') : new Date();
+}
+
 export function toDateString(d: Date): string {
   return d.toISOString().split('T')[0];
 }
@@ -9,15 +20,15 @@ export function addDays(d: Date, n: number): Date {
 }
 
 export function getDefaultDepartureDate(): string {
-  return toDateString(addDays(new Date(), 14));
+  return toDateString(addDays(getNow(), 14));
 }
 
 export function getDefaultReturnDate(): string {
-  return toDateString(addDays(new Date(), 21));
+  return toDateString(addDays(getNow(), 21));
 }
 
 export function getMaxBookingDate(): string {
-  const d = new Date();
+  const d = getNow();
   d.setMonth(d.getMonth() + 12);
   return toDateString(d);
 }