time: fix time offset (#9449)

vlib/time/time_test.v

@@ -1,4 +1,5 @@
 import time
+import math
 
 const (
 	time_to_test = time.Time{
@@ -223,3 +224,24 @@ fn test_unix_time() {
 	assert utm2 - utm1 > 2
 	assert utm2 - utm1 < 999
 }
+
+fn test_offset() {
+	u := time.utc()
+	n := time.now()
+	//
+	mut diff_seconds := 0
+	if u.day != n.day {
+		if u.day > n.day {
+			diff_seconds = int(math.abs(((u.hour * 60 + u.minute) - (n.hour * 60 + n.minute)) * 60)) - 86400
+		} else {
+			diff_seconds = 86400 - int(math.abs(((u.hour * 60 + u.minute) - (n.hour * 60 + n.minute)) * 60))
+		}
+		if math.abs(u.day - n.day) > 1 { // different month
+			diff_seconds = diff_seconds * -1
+		}
+	} else { // same day
+		diff_seconds = ((n.hour * 60 + n.minute) - (u.hour * 60 + u.minute)) * 60
+	}
+
+	assert diff_seconds == time.offset()
+}

vlib/time/time_windows.c.v

@@ -114,8 +114,8 @@ pub fn (t Time) local() Time {
 		hour: st_local.hour
 		minute: st_local.minute
 		second: st_local.second // These are the same
-		microsecond: t.microsecond
+		microsecond: st_local.millisecond * 1000
-		unix: t.unix
+		unix: u64(st_local.unix_time())
 	}
 	return t_local
 }