Progress...

datetime.c

@@ -76,3 +76,64 @@ void dateTimeGetTimespec(DateTime *self, struct timespec * ts) {
     ts->tv_nsec = self->nanoseconds;
     ts->tv_sec  = (time_t)dateTimeGetTimestamp(self);
 }
+
+Weekday dateTimeGetWeekday(DateTime *self) {
+    int64_t ts = dateTimeGetTimestampNaive(self);
+    ts /= SECONDS_PER_DAY;
+    return ts % 7;
+}
+
+void dateTimeFromTimestampParts(int64_t seconds, int64_t nanoseconds, DateTime *dt) {
+    int64_t secs;
+    Month   month;
+    int     ret = 0;
+    
+    dt->nanoseconds = nanoseconds;
+    if (seconds < 0) {
+        secs = seconds;
+        yearNew(&dt->year, 1969);
+        while (secs > -yearGetSeconds(&dt->year)) {
+            secs += yearGetSeconds(&dt->year);
+            yearDecrement(&dt->year);
+        }
+        month = December;
+        while (ret == 0) {
+            if (secs > monthGetSeconds(month, &dt->year)) break;
+            secs += monthGetSeconds(month, &dt->year);
+            monthDecrement(&month);
+        }
+        ret = 0;
+        dt->month = month;
+        dt->day = monthGetDays(month, &dt->year);
+        //todo
+    } else if (seconds > 0) {
+        secs = seconds;
+        yearNew(&dt->year, 1970);
+        while (yearGetSeconds(&dt->year) < seconds) {
+            secs -= yearGetSeconds(&dt->year);
+            yearIncrement(&dt->year);
+        }
+        dt->month = January;
+        while (monthGetSeconds(dt->month, &dt->year) < secs) {
+            secs -= (int64_t)monthGetSeconds(dt->month, &dt->year);
+            monthIncrement(&dt->month);
+        }
+        dt->day = secs / SECONDS_PER_DAY;
+        secs %= SECONDS_PER_DAY;
+        dt->hour = secs / SECONDS_PER_HOUR;
+        secs %= SECONDS_PER_HOUR;
+        dt->minute = secs / 60;
+        secs %= 60;
+        dt->second = secs;
+    } else {
+        yearNew(&dt->year, 1970);
+        dt->month = January;
+        dt->day = 1;
+        dt->hour = 0;
+        dt->minute = 0;
+        dt->second = 0;
+    }
+}
+
+void dateTimeFromTimespec(struct timespec *ts, DateTime *dt) {
+}

include/epoch.h

@@ -144,5 +144,8 @@ int32_t dateTimeGetYear(DateTime *self);
 int64_t dateTimeGetTimestampNaive(DateTime *self);
 int64_t dateTimeGetTimestamp(DateTime *self);
 void dateTimeGetTimespec(DateTime *self, struct timespec *ts);
+Weekday dateTimeGetWeekday(DateTime *self);
+void dateTimeFromTimestampParts(int64_t seconds, int64_t nanoseconds, DateTime *dt);
+void dateTimeFromTimespec(struct timespec *ts, DateTime *dt);
 
 #endif // !LIBEPOCH_H