Pivot Points Calculator!

Hi All,
I have been using price line to draw S/R for sometimes now and i notice that there are better ways to do this through pivot point calculator.Hence i am just wondering how do you calculate pivot points for 1 hr and 4 hr TFs.
Thank you.

Pivot Point Calculator: Free Online Calculations of Forex Pivot Points

Pivot Points: Introduction to Pivot Points for Forex Currency Trading

Thank you.I know about this already and you will agree with me that the above links dont address the main issue about pivot points.Where is the closing date,opening date and the stuffs. Some say close time is 5pm EST friday and open time is 5pm EST sun for Daily TF… If that is the case what about 4hr and 1hr?
I need correct dates and specifications to get things right.