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One may accept Shabbos early based on the concept of Tosafos Shabbos. See Shulchan Aruch Orach Chaim, 267:2. If a woman has a Hilchos Niddah vest on Friday such as Yom Hachodesh & accepts Shabbos early, does she still need to keep the Halachos of her vest until sunset or does early Shabbos make it the next day in regards to her vest?

I know there are several questions on MY regarding early Shabbos and other Halachos (such as putting on Tefilin) but I don't know whether all cases would have the same answers. Hence the reason for my question.

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    What about after Shkiya on Saturday evening when it's still Shabbat but no longer day-Onah? Note as well that a Hefsek Tahara before sunset after Maariv is generally seen as OK at least bedieved (YD 196:1)
    – Double AA ♦
    May 25, 2017 at 16:26
  • @Earl This is definitely not an answer, but my strong instinct based on hilchos shabbos, davening, etc. when some people are keeping Shabbos or yom tov or fasts and others aren't is that your personally-imposed time of observance does not affect anything else, and would paritcularly not loosen any independent halachas such as T"H. In other words, it is still her vest. Also++
    – SAH
    May 25, 2017 at 18:16
  • I tend to agree with you. Maybe someone can source it for us.
    – Earl
    May 25, 2017 at 20:10
  • The halacha for a veset would probably be more connected to the physical day than to a "personal day". A veset is meant to anticipate a woman's cycle and should follow the natural end of day.
    – user8726
    May 25, 2017 at 20:52
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    We say the Shema again at nacht even though we brought in Shabbos early. So you can see that bringing in early does not convert day into night for Shema at least and I suggest vestaos as well.
    – Avrohom Yitzchok
    May 26, 2017 at 7:49

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Shabbos is exactly 24 hours according to the Torah (See maseches Moed koton daf 3b-4a)and tosefes shabbos is a very short amount of time a matter of seconds (tos moed koton 4a), but we don't know exactly when it starts and ends so we keep from shekia (sunset) which is the start of bein hashmoshos (the unknown zone) and motzei shabbos ends at tzeis (either night fall or 72 minutes after sunset) that period we keep shabbos as a must. . and tosefos 4a "ma".

The source of a veses spanning 12 daylight hours (i.e split all the day light equally into 12 hours) or night hours is in Niddah 63b היתה למודה להיות רואה מיום עשרים ליום עשרים ומשש שעות לשש שעות הגיע יום עשרים ולא ראתה אסורה לשמש כל שש שעות ראשונות דברי רבי יהודה ורבי יוסי מתיר עד שש שעות וחוששת בשש שעות עברו שש שעות ולא ראתה אסורה לשמש כל היום כולו דברי ר' יהודה ורבי יוסי מתיר מן המנחה ולמעלה: אמר רבא הלכה כרבי יהודה - (translation according to rabbi Yehuda whom the halacha follows) If she was used to discharging blood on day 20 at 6 hours in the day, had day 20 arrived and she has not yet discharged blood she is forbidden to her husband until the 6th hour( when she is expected to discharge blood), If she still hadn't discharged blood after 6 hours she is still forbidden for the remain of the entire day.

Therefore even though miderabbonon we add on to shabbos even more than the necessary from plag hamincha onward on friday as is allowed in halacha, we still can't change the day boundaries with regards to her veses, and a veses of the day is till nightfall (i.e beyond sunset) as we don't know when the next day starts.

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