Xiànzài dàoqiàn tài wǎn le.
现在道歉太晚了。
It's too late to apologize.
Notes:
现在(xiànzài): now
道歉(dàoqiàn): to apologize
太……了(tài...le): too
晚(wǎn): be late
Example:
A:对不起。
Duìbùqǐ.
I'm sorry.
B:现在道歉太晚了。
Xiànzài dàoqiàn tài wǎn le.
It's too late to apologize.