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 王天杨
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/**
* @name toDate
* @category Common Helpers
* @summary Convert the given argument to an instance of Date.
*
* @description
* Convert the given argument to an instance of Date.
*
* If the argument is an instance of Date, the function returns its clone.
*
* If the argument is a number, it is treated as a timestamp.
*
* If the argument is none of the above, the function returns Invalid Date.
*
* **Note**: *all* Date arguments passed to any *date-fns* function is processed by `toDate`.
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param argument - The value to convert
*
* @returns The parsed date in the local time zone
*
* @example
* // Clone the date:
* const result = toDate(new Date(2014, 1, 11, 11, 30, 30))
* //=> Tue Feb 11 2014 11:30:30
*
* @example
* // Convert the timestamp to date:
* const result = toDate(1392098430000)
* //=> Tue Feb 11 2014 11:30:30
*/
export function toDate(argument) {
const argStr = Object.prototype.toString.call(argument);
// Clone the date
if (
argument instanceof Date ||
(typeof argument === "object" && argStr === "[object Date]")
) {
// Prevent the date to lose the milliseconds when passed to new Date() in IE10
return new argument.constructor(+argument);
} else if (
typeof argument === "number" ||
argStr === "[object Number]" ||
typeof argument === "string" ||
argStr === "[object String]"
) {
// TODO: Can we get rid of as?
return new Date(argument);
} else {
// TODO: Can we get rid of as?
return new Date(NaN);
}
}
// Fallback for modularized imports:
export default toDate;
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