1 files changed, 35 insertions, 0 deletions

diff --git a/firmware/common/timefuncs.c b/firmware/common/timefuncs.c
index fb16f0c253..e48aadd0a2 100644
--- a/firmware/common/timefuncs.c
+++ b/firmware/common/timefuncs.c
@@ -130,3 +130,38 @@ int set_time(const struct tm *tm)
     return 0;
 #endif
 }
+
+/* mktime() code taken from lynx-2.8.5 source, written
+ by Philippe De Muyter <phdm@macqel.be> */
+time_t mktime(struct tm *t)
+{
+    short month, year;
+    time_t result;
+    static int m_to_d[12] =
+        {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+
+    month = t->tm_mon;
+    year = t->tm_year + month / 12 + 1900;
+    month %= 12;
+    if (month < 0)
+    {
+        year -= 1;
+        month += 12;
+    }
+    result = (year - 1970) * 365 + (year - 1969) / 4 + m_to_d[month];
+    result = (year - 1970) * 365 + m_to_d[month];
+    if (month <= 1)
+        year -= 1;
+    result += (year - 1968) / 4;
+    result -= (year - 1900) / 100;
+    result += (year - 1600) / 400;
+    result += t->tm_mday;
+    result -= 1;
+    result *= 24;
+    result += t->tm_hour;
+    result *= 60;
+    result += t->tm_min;
+    result *= 60;
+    result += t->tm_sec;
+    return(result);
+}