Can someone explain how tax harvesting works.

So my plan is to buy VTI and VXUS for my taxable, now with tax harvesting I would go and if it’s down I would sell vti for an equivalent fund (ITOT) 30 days before tax day and let that sit in there until my taxes are filed and then sell that fund back for VTI, and same goes for VXUS. And I guess if This is right, what’s the day that you need to sell your fund for it to count as a loss. -12345

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