The one that comes first out of two or more possibilities

जो पहले हो

English Usage: The project must be completed by the end of the month or when we receive the funding, whichever is earlier.

Hindi Usage: परियोजना को महीने के अंत तक या जब हमें फंडिंग प्राप्त हो, जो पहले हो, पूरा करना होगा।