Z time machine is a powerful time calculator.
It may add and subtract dates or time in hours and minutes, or calculate the difference between dates or times.
It may calculate two dates at the same time, one in your local calendar and another in GMT adjusting the UTC time difference (offset).
Select the initial date in UTC1 or LOCAL1.
If you choose LOCAL select the correct UTC time offset first when looking for UTC.
Select the time lapse you want to add or substract in TIME LAPSE.
You may choose days, hours and minutes, or number of minutes or an amount of hours and minutes. The three options are interconnected so you may know either how many minutes are in 1 day or how many days are xxx minutes, or how many hours, etc.
If you want to add dates live the switch on the left. To substract move it to the right.
Thats it.
Tap the leds to fix its correspondent value. It will turn on red.
If the value you fixed changes, it will turn green led. That means the fixed values combination chosen are not logical and the values in green were forced to change.
Time selection is done through rotating wheels.
Every data is selected with a single finger.
Any change made will recalculate immediately.
Fits to any Ipad orientation.
iPhones only portrait to any different screen resolution from Iphone 5 to Iphone 6 plus even with zoom view..
Visit http://flybyware.com for more complete instructions.