add flexibility to componentDidUpdate

[donaldsin]

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[donaldsin]

imagine when there is a state change to clear the current value (i.e. the value is an empty String), it will be better to reset the default opening screen to current date, instead of caching the previous value.
Plus, It will throw error when there is a change in maxDate or minDate when value is empty, as the state of date, month and year were cached, and it is out of range