1 files changed, 22 insertions, 0 deletions

diff --git a/libntp/calyearstart.c b/libntp/calyearstart.c
new file mode 100644
index 000000000000..0f7ca4f9d065
--- /dev/null
+++ b/libntp/calyearstart.c
@@ -0,0 +1,22 @@
+/*
+ * calyearstart - determine the NTP time at midnight of January 1 in
+ *		  the year of the given date.
+ */
+#include <sys/types.h>
+
+#include "ntp_types.h"
+#include "ntp_calendar.h"
+#include "ntp_stdlib.h"
+
+u_long
+calyearstart(u_long ntp_time)
+{
+    struct calendar jt;
+
+    caljulian(ntp_time,&jt);
+    jt.yearday  = 1;
+    jt.monthday = 1;
+    jt.month    = 1;
+    jt.hour = jt.minute = jt.second = 0;
+    return caltontp(&jt);
+}