Last date for Tax loss harvest?

Here People Saying we can book Loss on 30 March Monday because 31st is holiday but

Quicko sending email to Upstox users says

Note: While the financial year ends on March 31st, the stock market is closed on the weekend. This means

Friday, March 27th is your last chance to execute Tax Harvesting trades why quicko saying 27th is the Last date to book Losses ?

@siva @Quicko