Online application start date for dehradun university is MAY 24th 2019. 

Whereas you can keep checking their website for further notifications or change in the dates. 

Last year the application process for BA course started from 25th May and ended on 17th June. The entrance exam was scheduled on 28th June. So you can expect the entire process for this year to be lined up in the similar way and around the same time window, with some minor fluctuations.

For more details you can visit the link -

https://www.doonuniversity.org/admissions