Node.js DateHelper abstracts the date properties into a simple add or subtract days. The method also exposes a function to return the formatted date according to YYYY-MM-DD
class DateHelper {
constructor(dateString?: string = null) {
this.date = new Date(dateString);
}
public addDays(days): void {
this.date.setDate(this.date.getDate() + days);
return this;
}
removeDays(days): void {
this.date.setDate(this.date.getDate() - days);
return this;
}
getFormattedDate(): string {
const year = this.date.getFullYear();
const month = this.date.getMonth() + 1;
const day = this.date.getDate();
return `${year}-${month < 10 ? '0' + month : month}-${day < 10 ? '0' + day : day}`;
}
}
To use this helper, simply create a new instance of the DateHelper class with a string date as the parameter:
const dateHelper = new DateHelper('2023-02-27');
You can then add or remove days by calling the addDays or removeDays methods, respectively:
dateHelper.addDays(3); // add 3 days to the date
dateHelper.removeDays(2); // remove 2 days from the date
Finally, you can get the formatted date string by calling the getFormattedDate method:
const formattedDate = dateHelper.getFormattedDate(); // returns "2023-03-02"
Note that the getFormattedDate method returns the date in the format "YYYY-MM-DD". If you need a different format, you can modify the method accordingly.
Here's an example of how you could write Jest tests for the DateHelper class:
describe('DateHelper', () => {
test('should add days to date', () => {
const dateHelper = new DateHelper('2023-02-27');
dateHelper.addDays(3);
expect(dateHelper.getFormattedDate()).toBe('2023-03-02');
});
test('should remove days from date', () => {
const dateHelper = new DateHelper('2023-02-27');
dateHelper.removeDays(2);
expect(dateHelper.getFormattedDate()).toBe('2023-02-25');
});
test('should format date correctly', () => {
const dateHelper = new DateHelper('2023-02-27');
expect(dateHelper.getFormattedDate()).toBe('2023-02-27');
});
});
In this test suite, we have three tests:
- The first test checks that the addDays method correctly adds days to the date and returns the expected formatted date.
- The second test checks that the removeDays method correctly removes days from the date and returns the expected formatted date.
- The third test checks that the getFormattedDate method returns the expected formatted date.
PASS src/date-helper.test.js
DateHelper
✓ should add days to date (3 ms)
✓ should remove days from date
✓ should format date correctly (1 ms)
Test Suites: 1 passed, 1 total
Tests: 3 passed, 3 total
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