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Effects of time on the delta

As the time remaining to expiration grows shorter, the time value of the option evaporates and correspondingly, the delta of in-the-money options increases while the delta of out-of-the-money options decreases.

Time to Expiration and its Effects on Option Delta

The chart above illustrates the behaviour of the delta of options at various strikes expiring in 3 months, 6 months and 9 months when the stock is currently trading at $50.