From 88084ebf4abe6b9e25daf194248e4400469ba432 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Fr=C3=A8rebeau?=
 <remy.frerebeau@systemathics.com>
Date: Tue, 25 Apr 2023 18:17:51 +0200
Subject: [PATCH 1/2] update hk calendar

---
 ql/time/calendars/hongkong.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/ql/time/calendars/hongkong.cpp b/ql/time/calendars/hongkong.cpp
index 7b5d4283659..9b01514204a 100644
--- a/ql/time/calendars/hongkong.cpp
+++ b/ql/time/calendars/hongkong.cpp
@@ -329,6 +329,40 @@ namespace QuantLib {
                return false;
         }
 
+        if (y == 2022)
+        {
+            if (// Lunar New Year
+                ((d >= 1 && d <= 3) && m == February)
+                // Ching Ming Festival
+                || (d == 5 && m == April)
+                // Buddha's birthday
+                || (d == 9 && m == May)
+                // Tuen Ng festival
+                || (d == 3 && m == June)
+                // Mid-autumn festival
+                || (d == 12 && m == September)
+                // Chung Yeung festival
+                || (d == 4 && m == October))
+                return false;
+        }
+
+        if (y == 2023)
+        {
+            if (// Lunar New Year
+                ((d >= 23 && d <= 25) && m == January)
+                // Ching Ming Festival
+                || (d == 5 && m == April)
+                // Buddha's birthday
+                || (d == 26 && m == May)
+                // Tuen Ng festival
+                || (d == 22 && m == June)
+                // Mid-autumn festival
+                || (d == 12 && m == September)
+                // Chung Yeung festival
+                || (d == 4 && m == October))
+                return false;
+        }
+
         return true;
     }
 

From 1735e07b5b515c63061e10e5c2e55588f00aeb9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Fr=C3=A8rebeau?=
 <remy.frerebeau@systemathics.com>
Date: Wed, 26 Apr 2023 11:22:51 +0200
Subject: [PATCH 2/2] HKEx calendar update

---
 ql/time/calendars/hongkong.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/ql/time/calendars/hongkong.cpp b/ql/time/calendars/hongkong.cpp
index 9b01514204a..ab22dde919f 100644
--- a/ql/time/calendars/hongkong.cpp
+++ b/ql/time/calendars/hongkong.cpp
@@ -329,6 +329,25 @@ namespace QuantLib {
                return false;
         }
 
+        // data from https://www.hkex.com.hk/-/media/hkex-market/services/circulars-and-notices/participant-and-members-circulars/sehk/2020/ce_sehk_ct_038_2020.pdf
+        if (y == 2021)
+        {
+            if (// Lunar New Year
+                ((d == 12 || d == 15) && m == February)
+                // Ching Ming Festival
+                || (d == 5 && m == April)
+                // Buddha's birthday
+                || (d == 19 && m == May)
+                // Tuen Ng festival
+                || (d == 14 && m == June)
+                // Mid-autumn festival
+                || (d == 22 && m == September)
+                // Chung Yeung festival
+                || (d == 14 && m == October))
+                return false;
+        }
+
+        // data from https://www.hkex.com.hk/-/media/HKEX-Market/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEHK/2021/ce_SEHK_CT_082_2021.pdf
         if (y == 2022)
         {
             if (// Lunar New Year
@@ -346,6 +365,7 @@ namespace QuantLib {
                 return false;
         }
 
+        // data from https://www.hkex.com.hk/-/media/HKEX-Market/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEHK/2022/ce_SEHK_CT_058_2022.pdf
         if (y == 2023)
         {
             if (// Lunar New Year