A free browser cron editor with timezone selection and previews of upcoming execution dates.
Free
cron-parser
An MIT-licensed JavaScript and TypeScript library for parsing cron expressions and calculating execution dates.
About cron-parser
cron-parser is a JavaScript and TypeScript library for parsing cron expressions and calculating execution dates. It is installed with npm and used in Node.js or TypeScript code. Given an expression such as '/2 *', it can return the next date, the previous date, or a set of upcoming dates through an iterator.
The library supports timezone handling through a tz option, including daylight saving time handling, and accepts start and end dates to limit an iteration range. The README lists Node.js 18 or later and TypeScript 5 or later as requirements. The library is MIT-licensed and free to use.
Key features
- Parses cron expressions with an optional seconds field
- Calculates next and previous execution dates from an expression
- Returns several upcoming dates through an iterator
- Timezone support through a tz option, such as Europe/London
- Start and end date options that limit an iteration range
- Supports L, #, and H characters and predefined aliases such as @daily
Best for: Developers building Node.js or TypeScript applications that need to calculate run times from cron schedules.
Good for
- Free and MIT-licensed open source library
- Handles timezones and daylight saving time transitions
- Installable with a single npm command
Watch out for
- Requires Node.js 18 or later and TypeScript 5 or later
- String dates must use ISO8601, HTTP and RFC2822, or SQL formats
cron-parser at a glance
- Category
- Development › Web Development
- Type
- Online tool
- Pricing
- Free
- Open source
- Yes
- Last checked
- Oct 9, 2026 · Online when checked
- Listed
- Oct 9, 2026
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cron-parser FAQ
Which date string formats does the library accept?
The README lists ISO8601, HTTP and RFC2822, and SQL formats for string dates.
Which Node.js version is required?
The README lists Node.js version 18 or later.
How is the library installed?
It is installed with the command npm install cron-parser.
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