# Beste UI > Beautiful, accessible blocks, pieces and components for shadcn/ui and Tailwind CSS, built for React and Next.js. Install one with the shadcn CLI and the code is yours to edit: no runtime dependency, nothing to upgrade. Markdown rendition of https://ui.beste.co/tools/cron-expression. Every page on the site has one: add `.md` to any address, or send `Accept: text/markdown`. Whole catalog for LLMs: https://ui.beste.co/llms.txt. Registry index: https://ui.beste.co/r/registry.json --- [tools](/tools)/[time](/tools/category/time) # Cron expression editor Read a cron expression in a sentence, see the next six times it fires in your own zone, and start from a preset if the fields are the part you never remember. Expression At 09:00 on Monday, Tuesday, Wednesday, Thursday and Friday. Every 15 minutes\*/15 \* \* \* \*Hourly, on the hour0 \* \* \* \*Every weekday at 09:000 9 \* \* 1-5Nightly at 03:3030 3 \* \* \*Mondays at 08:000 8 \* \* 1First of the month0 0 1 \* \* Times are your own. A cron on a server runs in that server's zone, which is UTC unless someone changed it, and that difference is where most missed jobs come from. ## Questions Which fields does it take?+ The standard five: minute, hour, day of month, month and weekday. Seconds, @yearly aliases and the L and W extensions are refused rather than guessed at, because they are not portable. Why does a job with both a day and a weekday fire so often?+ Because cron treats them as or, not and, whenever both are restricted. 0 12 13 \* fri runs every Friday and on the 13th, which is the rule that surprises almost everyone. Which zone are the next runs in?+ Yours, as the browser reports it. A cron on a server runs in that server's zone, which is UTC unless somebody changed it, and that gap is where most missed jobs come from. What happens to my job when the clocks change?+ In a zone with daylight saving, a job scheduled at 02:30 can run twice in autumn and not at all in spring. Run anything that must happen exactly once in UTC, or pick a time outside the change window, which in most zones is between 01:00 and 03:00. ## Related tools [Unix timestamp converterTurn a Unix timestamp into ISO, UTC and your own time zone at once, or paste a date and read the epoch back. Seconds and milliseconds both.](/tools/timestamp-converter)[Time zone converterPick a time in one zone and read it in all the others at once, with the offsets shown and daylight saving handled by the browser's own database.](/tools/timezone-converter) Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · ## The tools are free. So is most of the library. 1935 blocks and 989 pieces for shadcn/ui and Tailwind, built on the same tokens these tools write. Install one with a command and the code is yours. [Browse the blocksBrowse the blocks](/blocks) No signup for the tools. MIT for free blocks, commercial licence for Pro. ## Ship the interface, keep the code. New blocks, pieces and components every week. Install one with a command and it is yours to edit. No runtime dependency, no upgrade path to fight. [Browse the libraryBrowse the library](/blocks)[See pricingSee pricing](/pricing) ### Library * [Blocks](/blocks) * [Pages](/pages) * [Pieces](/pieces) * [Components](/components) * [Search](/search) ### Learn * [Docs](/docs) * [AI & MCP](/docs/mcp) * [Blog](/blog) * [Free tools](/tools) * [What's new?](/changelog) * [Website Builder](https://beste.co) ### More * [Pricing](/pricing) * [Referrals](/referrals) * [License](/license) * [GitHub](https://github.com/beste-co/beste-ui) ### Shadcn Blocks * [Shadcn Hero Blocks](/blocks/hero) * [Shadcn Feature Blocks](/blocks/feature) * [Shadcn Pricing Blocks](/blocks/pricing) * [Shadcn CTA Blocks](/blocks/cta) * [Shadcn FAQ Blocks](/blocks/faq) * [Shadcn About Blocks](/blocks/about) * [Shadcn Stats Blocks](/blocks/stats) * [Shadcn Footer Blocks](/blocks/footer) * [Shadcn Navigation Blocks](/blocks/navigation) * [Shadcn Auth Blocks](/blocks/auth) * [Shadcn Ecommerce Blocks](/blocks/ecommerce) * [Shadcn Portfolio Blocks](/blocks/portfolio) * [Shadcn Showcase Blocks](/blocks/showcase) * [Shadcn Careers Blocks](/blocks/careers) * [Shadcn Onboarding Blocks](/blocks/onboarding) * [Shadcn Coming Soon Blocks](/blocks/coming-soon) * [Shadcn Post Blocks](/blocks/post) * [Shadcn Legal Blocks](/blocks/legal) * [Shadcn Workflow Blocks](/blocks/workflow) * [Shadcn News Blocks](/blocks/news) © 2026, [Beste](https://beste.co). All rights reserved.