Tax on gambling income

ankesh2000 (articleship) (25 Points)

13 April 2019  
i played on a uk based gambling site and got a winning prize of 1.2 lakh . On which they have not deducted any TDS.
so i need to pay 30.9% from my end.
my question is here should i pay this tax the date when i withdrew that money (i.e. middle of a financial year )or end of the financial year at the time of return filling.