'When' or 'That'

English has many relative pronouns.

Most relative pronouns are the same as question words: who, which, whose, whom, where, when, and why.

That is also a relative pronoun.

Often there is more than one grammatically acceptable relative pronoun.

For example, we can say, "I have more friends who are boys."

This is something which everyone knows.

Or, "I have more friends that are boys."

This is something that everyone knows.

All the sentences are grammatically correct.

Usually, choosing the best pronoun depends on the usage.

In spoken English, we use that more often than other relative pronouns.

In academic written English, we use which more often than other relative pronouns.

In news writing, we use which and who the most.

Sanjeev, you asked about that.

Or when?

We do not use when as a relative pronoun very often.

We sometimes use when with expressions of time.

For example, there are a lot of times when we disagree.

But more often we do not use a relative pronoun.

There are a lot of times we disagree.

So, either of your sentences is grammatically correct, but most of the time in English, we would use that in your sentence, especially if it were spoken.

We hope this explanation has helped you, Sanjeev.

Do you have a question about American English?

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I'm Gina Bennett.