From cd3a3eb3ebf5f518bbf8aad169b5e3eecdd87c06 Mon Sep 17 00:00:00 2001
From: Maganty Rushyendra <mrushyendra@yahoo.com.sg>
Date: Mon, 29 Jun 2020 14:27:10 +0800
Subject: [PATCH] Fix weekday calculation in get_datetime_from_unix_time for
 negative times

Fix calculation for negative times to ensure Sundays are wrapped around to '0'
instead of '7', making it consistent with the output for positive times.

(cherry picked from commit aae5f246ff3b29a6a60d438d71523c8cc139be1b)
---
 core/bind/core_bind.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/bind/core_bind.cpp b/core/bind/core_bind.cpp
index 2f01bb636bf..975203ae4f9 100644
--- a/core/bind/core_bind.cpp
+++ b/core/bind/core_bind.cpp
@@ -868,7 +868,7 @@ Dictionary _OS::get_datetime_from_unix_time(int64_t unix_time_val) const {
 	} else {
 		dayno = (unix_time_val - SECS_DAY + 1) / SECS_DAY;
 		dayclock = unix_time_val - dayno * SECS_DAY;
-		date.weekday = static_cast<OS::Weekday>((dayno - 3) % 7 + 7);
+		date.weekday = static_cast<OS::Weekday>(((dayno % 7) + 11) % 7);
 		do {
 			year--;
 			dayno += YEARSIZE(year);