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TypeScript - day name for the first day of month
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In this article, we would like to show you how to get the first day name of the indicated month in TypeScript.
Quick solution:
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const days: string[] = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];2
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const year: number = 2021;4
const month: number = 7; // 0 - January, ..., 7 - August, ..., 11 - December5
const date: Date = new Date(year, month, 1);6
const day: string = days[date.getDay()];7
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console.log(day); // SundayWhere in the above code, we:
- use an array with names of the weekdays,
- create a date that represents the first day in the month - it is
Date(year, month, 1), - get day index in the week using
getDay()method - it counts days from0to6, staring from Sunday, - get the day name from the array using the day index.
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const days: string[] = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];2
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const getFirstDayName = (year: number, month: number): string => {4
const date = new Date(year, month, 1); // first day of the month5
return days[date.getDay()]; // getting day of the week (counted from 0 to 6 - Sunday as first)6
};7
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// Usage example:10
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console.log(getFirstDayName(2021, 0)); // Friday // 0 - January12
console.log(getFirstDayName(2021, 1)); // Monday // 1 - February13
console.log(getFirstDayName(2021, 2)); // Monday // 2 - MarchOutput:
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Friday2
Monday3
Monday