From eb4a7253f1d777046377ff2056c0a137f3dba498 Mon Sep 17 00:00:00 2001
From: Quantum <quantum2048@gmail.com>
Date: Fri, 20 Jun 2025 19:43:06 -0400
Subject: [PATCH] jcal: fix missing first week on negative JDN months

---
 jcal/src/Calendar.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jcal/src/Calendar.tsx b/jcal/src/Calendar.tsx
index 0a8408b..9baf68b 100644
--- a/jcal/src/Calendar.tsx
+++ b/jcal/src/Calendar.tsx
@@ -54,7 +54,7 @@ function Day({year, month, day, todayJDN}: DateProps & { todayJDN: number }): JS
 function Month({year, month, todayJDN}: MonthProps & { todayJDN: number }): JSX.Element {
     const decadeHeads = weekdayNames.map((name, i) => <WeekdayName key={i} name={name}/>);
     const firstJDN = julianJDN(year, month, 1);
-    const firstWeekday = (firstJDN + 1) % 7;
+    const firstWeekday = (firstJDN % 8 + 8) % 7;
     const daysTotal = julianMonthDays(year, month);
     return <div className="Month">
         <div className="Month-weekdayHead">{decadeHeads}</div>