Is "on" redundant in both British and American English?

English as a Second Language English Vocabulary, Grammar and Idioms
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Sebastian Lee, a member of the national sports association’s management committee, confirmed to The Straits Times yesterday that Lim’s last day of service was on Monday, adding: “Lim has spent more than 40 years since the founding of STF, contributing actively to the development of Singapore Taekwondo Federation and the propagation of the sport.”

Is “on” redundant in both British and American English?

Thanks

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Could somebody please help? Many thanks.

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Let’s see if @Alan, @Anglophile and @Andrea are available.

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I think you can drop prepositions as long as the meaning is clear.

Using “on” in this sentence is more correct though. I think many people drop prepositions.

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The use of ‘on’ is desirable but the present trend is to drop it wherever possible. As you say, the AmE does away with prepositions. But I would recommend its use so that there is more clarity.

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I think you need ‘on’ to make the day specific.

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Many thanks to all of you.

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