Hi @Vk,
I apologize for the late reply as it took me longer to realize this time down option.I'm sorry, but I didn't find an out-of-the-box way to do this. The time part of the Date and Time Picker is a text control by default, and the date picker and the text input box are linked together to make a complete Date and Time Picker, so we don't have a way to split it up to set up a control for now.
Another sophisticated way to do this is to use programming. Since our team is mainly responsible for SharePoint and is not very familiar with InfoPath development, we recommend you ask questions in this InfoPath Dev forum.
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Please accept my sincerely apologize for any in convenience this may cause. Thank you for your kind understanding.
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