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The mishnah in Nedarim 8:3 gives the following general rule:

This is the rule: Anything that has a set time and he says, "until it reaches that time," he is forbidden until that time. If he says, "until it will be," he is forbidden until it passes. And anything that does not have a set time, whether he says "until it will be" or whether he says "until it reaches," he is only forbidden until it arrives.

זֶה הַכְּלָל, כֹּל שֶׁזְּמַנּוֹ קָבוּעַ וְאָמַר עַד שֶׁיַּגִּיעַ, אָסוּר עַד שֶׁיַּגִּיּעַ. אָמַר עַד שֶׁיְּהֵא, אָסוּר עַד שֶׁיֵּצֵא. וְכֹל שֶׁאֵין זְמַנּוֹ קָבוּעַ, בֵּין אָמַר עַד שֶׁיְּהֵא, בֵּין אָמַר עַד שֶׁיַּגִּיעַ, אֵינוֹ אָסוּר אֶלָּא עַד שֶׁיַּגִּיעַ:‏

Shavuos doesn't have a fixed date, both because "in the times of Kiddush HaChodesh it could come out as early as 5 Sivan and as late as 7 Sivan," and because depending on factors such as crossing the date line, one person's Shavuos can be on a different day as someone else's (don't have a source, it's just what my rabbi has said).

How does this work in the context of a neder? Is Shavuos considered a "set time" for this purpose?

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    By Nedarim we follow common parlance. Commonly I'd think Shavout is assumed to have a fixed date. – Double AA Sep 15 '17 at 11:56
  • @Double-AA Maybe people who live near the date line would be accustomed to thinking of Shavuos as not having a fixed date. – C_D Sep 17 '17 at 4:34
  • Nearly no one actually holds that crossing the dateline matters in this regard, so if you're looking for a common parlance you're unlikely to find a community that has one. – Double AA Sep 17 '17 at 4:39
  • Is the calendar tag really appropriate? – Naftali Tzvi Oct 4 '17 at 4:10
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Shavuos has a set time even "in the times of Kiddush HaChodesh". It's day 50 of the Omer"!

So saying until the 4th day of Pessach or until the 50th day of the Omer (a.k.a Shavuos) would have the same status, i.e. something having a set time.

That's beside for Double AA's comment (which is the real answer):
By Nedarim we follow common parlance. Commonly I'd think Shavout is assumed to have a fixed date.

Your comment about the Dateline is a total enigma to me.

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    The 8th day of Chanukka too is a good example – Double AA Oct 17 '17 at 13:25
  • why don't you tick your own answer? – user15464 Oct 17 '17 at 14:41
  • @user15464 - only the user who asked the question can "Tick" it. – Danny Schoemann Oct 18 '17 at 13:10

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