Q.Will my sea time for the days spent in ship's dry docking be counted by MMD in India ?

Yes. If you are a navigating officer, It will be counted. There is no way someone can know for sure if the ship was dry docked during your tenure.If you have been to dry dock, you just need to make sure that you take the seatime letter for the full tenure on that ship and it should not exclude the period of dry dock.If you are a deck cadet then as per UK MCA (See this link for more details), the dry dock period or lay up period of the ship should not be more than 2 months. If it is less than 2 months, it is considered as the valid seatime.  As per Indian MMD (See the link), a reasonable time in dry dock is allowed as seatime, even though MMD has not defined reasonable time.

Hope it helps..