Regex and ISO8601 formatted DateTime [duplicate]

Answer 1

I found the RegExp that also tries to validate the date a bit overkill for me. I Just wanted to know if a string contains an ISO 8601 date string. I'll check if the date is actually valid after I have converted it to a Date object.

Here are 2 versions of the RegExp. This first checks if the string is a valid ISO 8601 date string. The other tests for a full date string including the hours/minutes/seconds (Commonly used in API's)

/**
 * RegExp to test a string for a ISO 8601 Date spec
 *  YYYY
 *  YYYY-MM
 *  YYYY-MM-DD
 *  YYYY-MM-DDThh:mmTZD
 *  YYYY-MM-DDThh:mm:ssTZD
 *  YYYY-MM-DDThh:mm:ss.sTZD
 * @see: https://www.w3.org/TR/NOTE-datetime
 * @type {RegExp}
 */
var ISO_8601 = /^\d{4}(-\d\d(-\d\d(T\d\d:\d\d(:\d\d)?(\.\d+)?(([+-]\d\d:\d\d)|Z)?)?)?)?$/i



/**
 * RegExp to test a string for a full ISO 8601 Date
 * Does not do any sort of date validation, only checks if the string is according to the ISO 8601 spec.
 *  YYYY-MM-DDThh:mm:ss
 *  YYYY-MM-DDThh:mm:ssTZD
 *  YYYY-MM-DDThh:mm:ss.sTZD
 * @see: https://www.w3.org/TR/NOTE-datetime
 * @type {RegExp}
 */
var ISO_8601_FULL = /^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d(\.\d+)?(([+-]\d\d:\d\d)|Z)?$/i


// Usage:

ISO_8601_FULL.test( "2016-05-24T15:54:14.876Z" )  // true
ISO_8601_FULL.test( "2002-12-31T23:00:00+01:00" ) // true
ISO_8601_FULL.test( "2016-02-01" )                // false
ISO_8601_FULL.test( "2016" )                      // false

ISO_8601.test( "2016-02-01" )                     // true
ISO_8601.test( "2016" )                           // true
ISO_8601.test( "2002-12-31T23:00:00+01:00" )      // true