The basic rule is that the rights of the parties should be determined on the basis of the date of institution of the suit or proceeding, however a court of law may take into account subsequent events inter alia in the following circumstances:.

1. the relief claimed originally has by reason of subsequent change of circumstances become inappropriate; or
2. it is necessary to take notice of subsequent events in order to shortern litigation; or
3. it is necessary to do so in order to do complete justice between the parties