Skript which delets some data from symbol

Trading time from my symbol is

8 am - 10  pm

I want delete all data for all timeframes M1,M5,M15,M30,H1,H4 for begin and end of day. As a result only following time should be left:

9 am- 8 pm.

Script can be done offline or online. In mql or another language... however. Not important for me. In any case i will save my data before exicuting your script.

TARGET:

I want do backtests and let my EA trade with new data. All indicators and the EA should work like data is only from 9 am- 8 pm  existing.

It means: If i call MACD H1 with perio=20: previously it calculats into the current value 14 hours from today and 6 from day before. But now only 10 hours a day are existing. Hence it calls 10 from today and 10 from day before. 

My EA works on M1, but uses also M5,M15,M30,H1,H4,D1 with a lot of indicators!!

And i want with new data run EA + Backtesting!!

Offline Chart+Ranko will not be possible (at all or not that easy or at least not by changing EA or all EA Indicators), as many experts told me.

----->>>Hence only solution is to manipulate data of MT4: totaly delete the gray marked data in all timeframes. And prevent MT4 from update it.<<<<-----