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import toInteger from "../_lib/toInteger/index.js";
import addHours from "../addHours/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
* @name subHours
* @category Hour Helpers
* @summary Subtract the specified number of hours from the given date.
*
* @description
* Subtract the specified number of hours from the given date.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @param {Date|Number} date - the date to be changed
* @param {Number} amount - the amount of hours to be subtracted. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
* @returns {Date} the new date with the hours subtracted
* @throws {TypeError} 2 arguments required
*
* @example
* // Subtract 2 hours from 11 July 2014 01:00:00:
* const result = subHours(new Date(2014, 6, 11, 1, 0), 2)
* //=> Thu Jul 10 2014 23:00:00
*/
export default function subHours(dirtyDate, dirtyAmount) {
requiredArgs(2, arguments);
var amount = toInteger(dirtyAmount);
return addHours(dirtyDate, -amount);
}
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