[4][5] He was born on 18 April 1962 in Nuwara Eliya as the youngest of the family with two elder sisters – Niranjali Sunethra and Nirmali Savithri.

His father Piyasena Witharana was a Local Government Officer and mother Nalini Daisybelle Jayasooriya was a housewife.

[9] He along with Deepika Priyadarshani, Wasantha Thilakangani and Anusha Malwatte made choir groups for Nanda Malini's musical shows.

Weerasinghe composed the music for his first four songs – Waten Eha, Namak Nodanna Malak (with Deepika), Aellen Nala (with Nirosha Virajini) and Thugu Giri Kula.

On 30 April 2002, Dayan released his first song album Obe Susum Pawan Salai at John de Silva theater.

[17] He has sung several classical and simple songs including, Mahada Adunu Ruwa, Daffodil Mala, Obe Neela Neth, Mage Jeewithe and Mawune Sada.