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const { default: dayjs } = await import("https://esm.sh/dayjs");
export async function countWeekdaysInMonth(
weekday:
| "Monday"
| "Tuesday"
| "Wednesday"
| "Thursday"
| "Friday"
| "Saturday"
| "Sunday",
month: Date = null,
): Promise<number> {
const referenceDate = month ?? new Date();
const startOfMonth = dayjs(referenceDate).startOf("month");
const endOfMonth = dayjs(referenceDate).endOf("month");
let dateCursor = startOfMonth.clone();
let found = 0;
while (dateCursor.isBefore(endOfMonth)) {
if (dateCursor.format("dddd") === weekday) {
found++;
}
dateCursor = dateCursor.add(1, "day");
}
return found;
}
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November 25, 2023