From 5e9e9e7fae5fa8979465521327b4d5e521263dc4 Mon Sep 17 00:00:00 2001
From: Quantum <quantum2048@gmail.com>
Date: Fri, 11 Jul 2025 00:31:33 -0400
Subject: [PATCH] =?UTF-8?q?common:=20implement=20extended=20Haab=CA=BC=20w?=
 =?UTF-8?q?ith=20year=20numbers?=
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We define year 0 as the year with the Mayan creation, i.e. Long Count date 0.0.0.0.0, with years incrementing every 0 Pop.
---
 common/src/mayan.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/common/src/mayan.ts b/common/src/mayan.ts
index 5186c7d..d83dd4d 100644
--- a/common/src/mayan.ts
+++ b/common/src/mayan.ts
@@ -108,6 +108,17 @@ export function jdnHaab(jdn: number): Haab {
     };
 }
 
+export type HaabExt = Haab & {
+    year: number,
+};
+
+export function jdnHaabExt(jdn: number): HaabExt {
+    return {
+        ...jdnHaab(jdn),
+        year: Math.floor((jdn - 583935) / 365),
+    };
+}
+
 export type LordOfNight = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
 
 export function formatLordOfNight(lordOfNight: LordOfNight): string {