1 files changed, 4 insertions, 0 deletions
diff --git a/src/date.c b/src/date.c
new file mode 100644
index 0000000..48642dd
--- /dev/null
+++ b/src/date.c
@@ -0,0 +1,4 @@
+int isleap(int year)
+{
+    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
+}