iso-datestring-validator
What is it
A simple package for validating strings denoting dates and time, including ISO 8601 format. The package provides the following functions:
-
Date validation. YYYY-MM-DD format from 0001-01-01 to 9999-12-31, leap year friendly. Custom digit separators and null separators supported: YYYY/MM/DD or YYYYMMDD is no problem.
-
Time validation. HH:mm:ss.fff±hh:mm format, seconds, fractions of seconds and timezone offset being optional. Custom digit separators supported for HHmmss as well (no custom separator for fractions, it is dot).
Caveat: do not use '-' and '+' as separators when validating time with timezone. I am reluctant to fix this unless it is an issue.
isValidTime('14-45-15.000+00-00', '-', true);
// will yield wrong result
-
Year-month validation.
-
ISO 8601 datestring validation with timezones, with and without separators:
- 2019-07-09T15:03:36.000+00:00
- 2019-07-09T15:03:36Z
- 20190709T150336Z
Installation
npm i --save iso-datestring-validator
or
yarn add iso-datestring-validator
Import
import * as isoDatestringValidator from 'iso-datestring-validator';
alternatively you can import the function that you need separately:
import {
isValidDate,
isValidISODateString,
isValidTime,
isValidYearMonth,
} from 'iso-datestring-validator';
Usage
Date validation
Pass a YYYY-MM-DD date string to the isValidDate function to check it. To validate dates that use a custom digit separator, pass it as the second argument.
import { isValidDate } from 'iso-datestring-validator';
isValidDate('2019-01-31');
// true
isValidDate('20190131');
// false, no custom digit separator provided, hyphen separator not found in the string
isValidDate('20190131', '');
// true
isValidDate('2019/01/31', '/');
// true
Time validation
Time string in HH:mm:ss.fff±hh:mm format can be validated with the isValidTime function. Seconds and fractions are optional. However, if using fractions min number of numbers is 1 and max is 9. Zone offset is optional as well, its check is switched off by default.
import { isValidTime } from 'iso-datestring-validator';
isValidTime('13:00');
// true
isValidTime('13:00:00');
// true
isValidTime('13:00:00.000000000');
// true
// pass time, separator and boolean flag to enable zone offset check
isValidTime('14:45:15.000+00:00', ':', true);
// true
// you can take advantage of default separator if you pass undefined as second param
isValidTime('14:45:15.000+00:00', undefined, true);
// true
isValidTime('144515.000Z', '', true);
// true
Year and month validation
These are validated by the isValidYearMonth function. Rules same as in the previous case: a string YYYY-MM and a custom digit separator if required.
import { isValidYearMonth } from 'iso-datestring-validator';
isValidYearMonth('2019/01', '/');
// true
isValidYearMonth('2019-01');
// true
ISO 8601 datestring validation
Pass a string to isValidISODateString to see if it is valid.
import { isValidISODateString } from 'iso-datestring-validator';
isValidISODateString('2019-07-09T15:03:36.000+00:00');
// true
isValidISODateString('20190709T150336Z');
// true
That's all about this package. Have fun, feel free to contribute with some test :]