don't overflow time value (would happen with excessive years)

>>> t
[20004, 6, 2, 0, 17, 3, 2, 154, 1]
>>> time.mktime(t)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OverflowError: mktime argument out of range

shared/common/kinds.py

@@ -1298,7 +1298,10 @@ class Time(BaseKind):
             # Set Daylight Saving Time to -1, so that it is handled
             # correctly by mktime.
             t = tuple(list(t[0:-1]) + [-1])
-            value = time.mktime(t)
+            try:
+                value = time.mktime(t)
+            except OverflowError:
+                raise faults.BadValue()
             return value
         return BaseKind.convertValueFromOtherType(self, value)