Is this legit, interview on a Saturday?

So, last week around the afternoon I got a call from someone claiming to be from the company TCS. The company is India based. The person asked for my resume and college transcripts, and so I did send them. A couple of days later I get an email for a teams interview. The interviewer scheduled it for the upcoming Saturday at 9:00 am (I am in the USA). I send an email to see if I can reschedule, but did not receive one back. Now I am not familiar with Indian based companies when it comes to, but is this legit to have a phone call on Saturday, and schedule an interview for the next Saturday?

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