@technobuddha/library
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A large library of useful functions
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<h1><a href="index.html">All files</a> days-in-month.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { type DateOptions, month } from './date.ts';
import { isLeapYear } from './is-leap-year.ts';
/**
* Determine the number of days in the month for a date
* @param input - The date
* @param options - see {@link DateOptions}
* @defaultValue utc false
* @returns The number of days in the specified month
* @group Time
* @category Month
*/
export function daysInMonth(input: Date, { utc = false }: DateOptions = {}): number {
switch (utc ? input.getUTCMonth() : input.getMonth()) {
case month.april:
case month.june:
case month.september:
case month.november: {
return 30;
}
case month.february: {
return isLeapYear(input) ? 29 : 28;
}
default: {
return 31;
}
}
}
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at 2025-09-10T15:22:40.218Z
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