From 609e613cdb933281b2bb28d1ee8318b4370713c4 Mon Sep 17 00:00:00 2001
From: Dan Salomon <dsalomon@mbta.com>
Date: Mon, 18 May 2026 18:39:21 -0400
Subject: [PATCH] feat: 6/13/26 service_date extended to 4:59 am on 6/14

---
 apps/parse/lib/parse/time.ex        |  9 +++++++++
 apps/parse/test/parse/time_test.exs | 14 ++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/apps/parse/lib/parse/time.ex b/apps/parse/lib/parse/time.ex
index d9c0b49bb..e9cdb5f40 100644
--- a/apps/parse/lib/parse/time.ex
+++ b/apps/parse/lib/parse/time.ex
@@ -14,6 +14,15 @@ defmodule Parse.Time do
   @spec service_date(DateTime.t()) :: Date.t()
   def service_date(current_time \\ DateTime.utc_now())
 
+  # Special case for 6/14/26 (6/13 service date after midnight) where service runs late.
+  # service_date changeover at 5 am, instead of the normal 3 am.
+  def service_date(%{year: 2026, month: 6, day: 14} = current_time) do
+    current_unix = DateTime.to_unix(current_time)
+    back_five_hours = current_unix - 18_000
+    {:ok, dt} = FastLocalDatetime.unix_to_datetime(back_five_hours, "America/New_York")
+    DateTime.to_date(dt)
+  end
+
   def service_date(%{year: _} = current_time) do
     current_unix = DateTime.to_unix(current_time)
     back_three_hours = current_unix - 10_800
diff --git a/apps/parse/test/parse/time_test.exs b/apps/parse/test/parse/time_test.exs
index db46a76d1..4528514e0 100644
--- a/apps/parse/test/parse/time_test.exs
+++ b/apps/parse/test/parse/time_test.exs
@@ -31,6 +31,20 @@ defmodule Parse.TimeTest do
       end
     end
 
+    test "returns the previous day until 4:59 am on 6/14/26, but not other dates" do
+      expected_late_night = ~D[2026-06-13]
+
+      for {time_str, expected_date} <- [
+            {"2026-06-14T04:59:59-04:00", ~D[2026-06-13]},
+            {"2026-06-14T05:00:00-04:00", ~D[2026-06-14]},
+            {"2026-06-15T03:00:00-04:00", ~D[2026-06-15]},
+            {"2026-06-13T03:00:00-04:00", ~D[2026-06-13]}
+          ] do
+        date_time = Timex.parse!(time_str, "{ISO:Extended}")
+        assert {time_str, service_date(date_time)} == {time_str, expected_date}
+      end
+    end
+
     test "function handles an ambiguous datetime" do
       expected = ~D[2017-11-04]