Asset Migration / Revaluation

Hi Community,

I am migrating an asset register for my client based on Historical Cost (as at 30 Jun 2015) in to the July 2015 period. They also need to undertake a revaluation of most assets asap once migration has completed.

I will also need to undertake the processing of intervening transactions i.e. Jul, Aug, Sep, Oct etc

1) Is the revaluation best done in the July 2015 period, which makes the reconciliation process more complicated or can I perform it in August 2015 period and backdate it to July 2015?

2) When is the best time to undertake the Jul, Aug, Sep txns processing?

i.e. option