@alwatr/parse-duration

Parse-duration

A simple, efficient utility to parse time duration strings into milliseconds or other time units.

Installation

npm install @alwatr/parse-duration
# or
yarn add @alwatr/parse-duration
# or
pnpm add @alwatr/parse-duration

Features

• Parse duration strings (like '10s', '5m', '2h') into milliseconds
• Convert between different time units
• TypeScript support with full type safety
• Zero dependencies (except for internal Alwatr utilities)
• Optimized for performance
• Comprehensive error handling

Usage

import {parseDuration} from '@alwatr/parse-duration';

// Basic usage - parse to milliseconds
parseDuration('10s');    // 10,000 (10 seconds in milliseconds)
parseDuration('5m');     // 300,000 (5 minutes in milliseconds)
parseDuration('2h');     // 7,200,000 (2 hours in milliseconds)
parseDuration('1.5d');   // 129,600,000 (1.5 days in milliseconds)

// Accept milliseconds as input
parseDuration(5000);     // 5,000 (pass through)

// Convert to different units
parseDuration('10d', 'h');  // 240 (10 days in hours)
parseDuration('1h', 'm');   // 60 (1 hour in minutes)
parseDuration('120s', 'm'); // 2 (120 seconds in minutes)
parseDuration(3600000, 'h'); // 1 (3600000 milliseconds in hours)

API

parseDuration(duration, toUnit?)

Parse a duration string or millisecond number into the specified unit (or milliseconds by default).

Parameters

• duration: string | number - A duration string (like '10s', '5m') or a number (treated as milliseconds)
• toUnit: DurationUnit (optional) - The unit to convert to. If omitted, returns milliseconds.

Returns

• number: The duration in the specified unit (or milliseconds if no unit specified)

Throws

• Error('not_a_number'): If the duration string doesn't contain a valid number
• Error('invalid_unit'): If the unit is not recognized
• Error('invalid_format'): If the duration format is invalid

Supported Units

Unit	Description	Milliseconds Equivalent
s	Second	1,000
m	Minute	60,000
h	Hour	3,600,000
d	Day	86,400,000
w	Week	604,800,000
M	Month (30d)	2,592,000,000
y	Year (365d)	31,536,000,000

TypeScript Support

import {parseDuration, DurationUnit, Duration} from '@alwatr/parse-duration';

// Type-safe unit parameter
function waitFor(time: Duration): Promise<void> {
  const ms = parseDuration(time);
  return new Promise((resolve) => setTimeout(resolve, ms));
}

// Usage
await waitFor('5s');

Sponsors

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Contributing

Contributions are welcome! Please read our contribution guidelines before submitting a pull request.