std/time: add the Zone method to Time

std/time/time.jule

@@ -166,6 +166,13 @@ impl Time {
 		ret absSeconds(self.abs())
 	}
 
+	// Computes the time zone in effect at time specification, returning the abbreviated
+	// name of the zone (such as "CET") and its offset in seconds east of UTC.
+	fn Zone(self): (name: str, offset: int) {
+		name, offset, _, _, _ = self.loc.lookup(self.sec)
+		ret
+	}
+
 	// Returns the year of the time.
 	fn Year(self): int {
 		century, cyear, ayday := self.absSec().days().split()