Determine in JavaScript if one date occurs exactly one week after another date

Currently, I am tackling a date comparison task for our application. The main objective is to compare the Start Date inputted by the user with the Operator/Region Effective Date, which signifies when a new list of product prices becomes valid. Our aim is to determine if there is an Effective Date set 7 days in advance of the Start Date. If this condition is met, we need to notify the user that price changes are imminent.

I believe the most efficient approach would be to add 7 days to the Start Date and then verify if it falls within the range of the Effective Date. However, I am encountering difficulties in adding 7 days to the Start Date as all my attempts have resulted in an "Invalid Date" error message. Any suggestions on how to address this issue?

Attempted Code Snippets

    public checkStartDates = () => {
    const checkDates = this.state.checkDate;
    const region = this.state.well.region;

    const d1 = new Date(checkDates.startDate + 7);

    const d2 = new Date(region.effectiveDate);

    console.log(d1, d2);
    if (d1 > d2) {
        alert ("Error!");
    }
}

    public checkStartDates = () => {
    const checkDates = this.state.checkDate;
    const region = this.state.well.region;

    const d1 = new Date(checkDates.startDate + 7);
    d1.setDate(d1.getDate() + 7);

    const d2 = new Date(region.effectiveDate);

    console.log(d1, d2);
    if (d1 > d2) {
        alert ("Error!");
    }
}

Answer №1

The issue at hand stems from the fact that `startDate` is most likely not a numerical value. Therefore, you are attempting to add a number onto something that is not recognized as one. This problem can be resolved by omitting the `+ 7` in the date initialization part and focusing on the already functioning line of code: `d1.setDate(d1.getDate() + 7);`.

To rectify the situation, consider implementing the following revised code snippet:


    const d1 = new Date(checkDates.startDate);
    d1.setDate(d1.getDate() + 7);

    const d2 = new Date(region.effectiveDate);

    console.log(d1, d2);
    if (d1 > d2) {
        alert("Error!");
    }

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