A vibrating simple pendulum of time period "T" is placed in a lift which is acceelating upwards. what is effect in time period?

there is no effect on time period .

There will be some change in its time period because lift is moving up and net acceleration will be sum of acceleration of lift and ā€˜gā€™. Change depends on acceleration of the lift .

if acceleration of lift will be constant . time period will change or not ?