Options Theta

can anyone explain why deep in the money put option value increases as it approaches maturity , and why isnt this true for call options ?

The upside on a put option is limited – the value of the underlying cannot go below zero – whereas the upside on a call option is unlimited. If a put is deep in the money, then the price of the underlying is close to zero. As time passes, it’s far more likely to increase in price (reducing the value of the put) than to decrease in price; the time value of the put is negative. As the put approaches expiration, the time value approaches zero, so it’s increasing.

now I got it , thanks a lot for the explanation

You’re quite welcome.