+time_t
+clock_unixtime();
+
+static inline time_t
+clock_tounixtime(datetime_t* dt)
+{
+ return (dt->year - 1970) * 31556926u + (dt->month - 1) * 2629743u +
+ (dt->day - 1) * 86400u + (dt->hour - 1) * 3600u +
+ (dt->minute - 1) * 60u + dt->second;
+}
+