After sunset - day or night?

I got my period in the time of "bein hashmashot". For purposes of the "prisha" days, is that considered daytime or nighttime, or both?? Thank you

Dear questioner,

Thank you for your question.

For the purposes of perishah days, the dividing lines are sunrise and sunset.  Since your flow began after sunset, even though it was before nightfall, your onat perishah is at night.

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