2

For wash sales, I've read there is a 30-day window both before and after an opening trade during which a loss from a closing trade becomes a wash sale with respect to the opening trade's cost basis calculation.

Does the time of day matter? Put another way, is the wash sale window calculated as ±30*24*60*60 seconds before/after the opening trade or is the time of day irrelevant and the date is just the opening trade's date ±30 days?

4

No, time of day doesn't matter. Its the whole day, it doesn't matter if you sold in the morning or bought in the evening.

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