# HG changeset patch
# User Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
# Date 1694615025 14400
#      Wed Sep 13 10:23:45 2023 -0400
# Node ID bb22b8ea2242b31537908a36d4e519cad5bd01c5
# Parent  6075f43a5d72873d7e0cc02a631d532d7ab2460e
time: add is_leap_year function

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

diff --git a/include/jeffpc/time.h b/include/jeffpc/time.h
--- a/include/jeffpc/time.h
+++ b/include/jeffpc/time.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
+ * Copyright (c) 2016-2017,2023 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -26,6 +26,7 @@
 #include <jeffpc/error.h>
 
 #include <inttypes.h>
+#include <stdbool.h>
 #include <time.h>
 
 static inline uint64_t __gettime(int clock)
@@ -57,4 +58,14 @@
 	return __gettime(CLOCK_REALTIME);
 }
 
+/*
+ * Various functions to deal with gregorian dates.
+ */
+
+/* Is the year leap? */
+static inline bool is_leap_year(int y)
+{
+	return ((y % 4) == 0) && (((y % 400) == 0) || ((y % 100) != 0));
+}
+
 #endif