It's hard to know. Sounds like customized code or an add-on solution. And what's the version of NAV? But if the "UPS pickup solution/customization" is doing it in a similar way to how normal orders calculate shipment dates, then it would be using customized calendars (they may or may not pickup/deliver all days) and the same functionality as you find there. Here it combines date-formulas with active/ in-active days, so that it will skip the in-active.
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