Approve v2 addition of timestamp/timezone/location

Author: meatballhat

testdata/godoc-v2.x.txt

@@ -1757,6 +1757,9 @@ func (t *Timestamp) Set(value string) error
 func (t *Timestamp) SetLayout(layout string)
     Set the timestamp string layout for future parsing
 
+func (t *Timestamp) SetLocation(loc *time.Location)
+    Set perceived timezone of the to-be parsed time string
+
 func (t *Timestamp) SetTimestamp(value time.Time)
     Set the timestamp value directly
 
@@ -1785,6 +1788,8 @@ type TimestampFlag struct {
 	EnvVars []string
 
 	Layout string
+
+	Timezone *time.Location
 }
     TimestampFlag is a flag with type *Timestamp