premiums

Theta value depends on no.of days required for expiry, but I observed that in day theta value is keep changing. How? If it depends on no. of days then how it it fluctuates up n down. please help me to understand.

I think I am missing some basics here! Today was expiry day(30MAR). I have been observing MRF since past week, but did not invest in it(I am still a newbie!). My guess was that the option premiums are going to increase. Because the underlying price was increasing. So I was observing 60000...