Advice regarding PIT 37

Does anyone know when should i submit the PIT 37?
i found online some websites state that due date was the end of March and others state that it's end of April.
Appreciate the insights.

Hi,

It is always end of April, this year it's Monday, 30th April. If the last day of April falls not on a working day, then it's first working day after that.

Cheers

Thank you for your prompt response.