A utility to calculate date ranges written in Swift.
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Calculate End Date — adds an amount of days/weeks/months/years to a start date; returns the resulting date.
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Calculate Duration — returns the number of days (plus weeks / work days / non-working days) between two dates.
Both return values so they chain into other Shortcuts actions, and provide spoken/printed dialog.
App Shortcuts — an AppShortcutsProvider surfaces both actions automatically with spoken phrases (e.g. "Calculate end date with Intervals").
