Upvote:2
What is important is that you enter the Schengen Area (pass through passport control) during your visa validity.
Whether you start your trip on the day or 5 days earlier is of no issue, they only care about when you enter the country/in this case Area.
You will have no issues in either Delhi or Colombo
From @Aganju
Mostly true - but you cannot plan idle a day or even some hours before passport control or so. The plane landing time must be after visa start