How to design EDW for source systems from different Time-Zones

How to design EDW for source systems from different Time-Zones?
Suppose IT landscape has a global BW in New York, and source systems in americas, europe and asia, then how the time-zones effect on time related things like delta selections on date or timestamp etc.

As you said BW is global in NY, your source system must be global too. People from various locations can connect to same source system and thus timestamps for delta is always maintained as 1 single time. We have same scenario in our project. Our R/3 system is used by users in US and Europe. So we run deltas twice in day to make sure we got deltas from both locations.
If scenarios was such that all locations connect to separate R/3 system, then obviously you have multiple queues. That is unique delta queue for each source system so deltas will be pulled as per data in respective queues.
Abhijit

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