How to use a Custom Date Comparison Function In Typescript
In this approach, a custom function is implemented to compare two date strings based on specific requirements or formats. This approach provides flexibility to tailor the comparison logic according to the application’s needs.
Syntax:
function compareDates(dateString1: string, dateString2: string): number {
// Custom comparison logic
}
Example: In this example Function compareDates compares two date strings, returning 0 if equal, -1 if first is earlier, and 1 if later. It then logs the comparison result.
function compareDates(dateString1: string, dateString2: string): number {
const date1: Date = new Date(dateString1);
const date2: Date = new Date(dateString2);
if (date1.getTime() === date2.getTime()) {
return 0; // Dates are equal
} else if (date1.getTime() < date2.getTime()) {
return -1; // First date is earlier than the second date
} else {
return 1; // First date is later than the second date
}
}
const dStr1: string = '2024-02-27';
const dStr2: string = '2024-02-27';
const comparisonResult: number = compareDates(dStr1, dStr2);
if (comparisonResult === 0) {
console.log(`${dStr1} is equal to ${dStr2}`);
} else if (comparisonResult < 0) {
console.log(`${dStr1} is earlier than ${dStr2}`);
} else {
console.log(`${dStr2} is earlier than ${dStr1}`);
}
Output:
2024-02-27 is equal to 2024-02-27
How to Compare Two Date Strings in TypeScript ?
In TypeScript, we can compare two date strings by converting them to comparable formats using Date objects or by parsing them into the timestamps. We will discuss different approaches with the practical implementation of each one of them.
Table of Content
- Using Date Objects
- Using Date.parse
- Using Intl.DateTimeFormat
- Using a Custom Date Comparison Function