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rrule
JavaScript library for working with recurrence rules for calendar dates as defined in the iCalendar RFC and more.
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widowadjust
Hate typographic widows hanging around on your site? Use this. See it in action on artequalswork.com
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Know the standards! I was making an app that lets you schedule repeatable tasks and had trouble implementing the logic to calculate the "second Tuesday of the month" reliably. Then I found RFC 5545 and rrule.js and it made it trivial.
We just got text-wrap: balance as of Chrome 114. Solves typographical issues like rag and orphans which might have previously needed something like widowadjust. Or type.js.
Related posts
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How Woovi handles complex date generation with Javascript
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Ask HN: Best API format for recurring schedules?
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Guidance to approach data modeling for a school schedule (subjects, students, places, etc.)
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repeating an event weekly in a calendar
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I make calendar software for a living. How're all of your Sundays going?