type Add = t.DateTime | (t.AddUnits & { yy?: number; yw?: number; mm?: number; ww?: number; dd?: number; hh?: number; mi?: number; ss?: number; wy?: number; ms?: number; us?: number; ns?: number; isoYear?: number; isoyear?: number; isoWeek?: number; isoweek?: number; } & t.TermOffset)
Add operations for adding durations to date/time