var isDate = require('../is_date/index.js')
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/**
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* @category Common Helpers
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* @summary Is the given date valid?
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*
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* @description
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* Returns false if argument is Invalid Date and true otherwise.
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* Invalid Date is a Date, whose time value is NaN.
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*
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* Time value of Date: http://es5.github.io/#x15.9.1.1
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*
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* @param {Date} date - the date to check
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* @returns {Boolean} the date is valid
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* @throws {TypeError} argument must be an instance of Date
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*
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* @example
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* // For the valid date:
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* var result = isValid(new Date(2014, 1, 31))
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* //=> true
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*
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* @example
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* // For the invalid date:
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* var result = isValid(new Date(''))
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* //=> false
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*/
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function isValid (dirtyDate) {
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if (isDate(dirtyDate)) {
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return !isNaN(dirtyDate)
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} else {
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throw new TypeError(toString.call(dirtyDate) + ' is not an instance of Date')
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}
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}
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module.exports = isValid
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