std/time: add the Second method to Time

std/time/time.jule

@@ -67,6 +67,11 @@ impl Time {
 		ret int(self.abs()%secPerDay) / secPerHour
 	}
 
+	// Returns the second offset within the minute specified by the time, in the range [0, 59].
+	fn Second(self): int {
+		ret int(self.abs() % secPerMinute)
+	}
+
 	// Returns the minute offset within the hour specified by the time, in the range [0, 59].
 	fn Minute(self): int {
 		ret int(self.abs()%secPerHour) / secPerMinute

std/time/time_test.jule

@@ -108,6 +108,18 @@ fn testTimeMinute(t: &testing::T) {
 	}
 }
 
+#test
+fn testTimeSecond(t: &testing::T) {
+	for i, test in unixAbsTests {
+		time := Unix(test.sec, 0)
+		second := time.Second()
+		if second != test.abs.Second {
+			t.Errorf("#{} conversion failed", i)
+			continue
+		}
+	}
+}
+
 #test
 fn testUnix(t: &testing::T) {
 	for i, test in unixAbsTests {