Highlight 7 day old date and time from current date and time

[Wasay21]

Issue - Urgent help
I have written a tamper monkey script to highlight date and time which are 7 days old from current date and time , the date and time format should be 6/28/2023, 10:31:39 PM , it should run in all tabs and webpages unable to highlight with my script

Please review my script for better understanding

v// ==UserScript==
// @name Date Highlighter
// @namespace http://tampermonkey.net/
// @Version 1.0
// @description Highlights dates older than 7 days
// @author Your name
// @match :///*
// @grant none
// @run-at document-idle
// ==/UserScript==

(function() {
'use strict';

// Configuration
const HIGHLIGHT_COLOR = '#ffeb3b'; // Yellow highlight
const DATE_PATTERNS = [
    // MM/DD/YYYY, HH:MM:SS AM/PM
    /(\d{1,2}\/\d{1,2}\/\d{4},?\s*\d{1,2}:\d{2}:\d{2}\s*[AP]M)/i,
    // MM/DD/YYYY
    /(\d{1,2}\/\d{1,2}\/\d{4})/,
    // YYYY-MM-DD
    /(\d{4}-\d{2}-\d{2})/
];

function isDateOlderThanDays(dateStr, days) {
    try {
        let date;
        if (dateStr.includes(',')) {
            // For format like "6/28/2023, 10:31:39 PM"
            date = new Date(dateStr);
        } else if (dateStr.includes('-')) {
            // For ISO format YYYY-MM-DD
            const [year, month, day] = dateStr.split('-');
            date = new Date(year, month - 1, day);
        } else {
            // For format like "11/14/2023"
            const [month, day, year] = dateStr.split('/');
            date = new Date(year, month - 1, day);
        }

        const now = new Date();
        const diffTime = now - date;
        const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
        console.log(`Date: ${dateStr}, Diff Days: ${diffDays}`); // Debug log
        return diffDays > days;
    } catch (e) {
        console.error('Date parsing error:', e, dateStr);
        return false;
    }
}

function createHighlightedSpan(text) {
    const span = document.createElement('span');
    span.style.backgroundColor = HIGHLIGHT_COLOR;
    span.style.padding = '2px';
    span.style.borderRadius = '3px';
    span.textContent = text;
    return span;
}

function processNode(node) {
    if (node.nodeType !== Node.TEXT_NODE || !node.textContent.trim()) {
        return;
    }

    const text = node.textContent;
    let hasMatch = false;
    let fragment = document.createDocumentFragment();
    let lastIndex = 0;

    DATE_PATTERNS.forEach(pattern => {
        pattern.lastIndex = 0; // Reset regex
        let match;

        while ((match = pattern.exec(text)) !== null) {
            const dateStr = match[0];
            if (isDateOlderThanDays(dateStr, 7)) {
                hasMatch = true;
                // Add text before the match
                if (match.index > lastIndex) {
                    fragment.appendChild(document.createTextNode(text.slice(lastIndex, match.index)));
                }
                // Add highlighted date
                fragment.appendChild(createHighlightedSpan(dateStr));
                lastIndex = pattern.lastIndex;
            }
        }
    });

    if (hasMatch) {
        // Add any remaining text
        if (lastIndex < text.length) {
            fragment.appendChild(document.createTextNode(text.slice(lastIndex)));
        }
        node.parentNode.replaceChild(fragment, node);
    }
}

function walkDom(node) {
    if (node.nodeType === Node.ELEMENT_NODE) {
        if (node.tagName === 'SCRIPT' || node.tagName === 'STYLE' || node.tagName === 'NOSCRIPT') {
            return;
        }
        Array.from(node.childNodes).forEach(walkDom);
    } else if (node.nodeType === Node.TEXT_NODE) {
        processNode(node);
    }
}

// Initial processing
console.log('Starting date highlighting...'); // Debug log
walkDom(document.body);

// Handle dynamic content
const observer = new MutationObserver((mutations) => {
    mutations.forEach(mutation => {
        mutation.addedNodes.forEach(node => {
            if (node.nodeType === Node.ELEMENT_NODE) {
                walkDom(node);
            }
        });
    });
});

// Start observing
observer.observe(document.body, {
    childList: true,
    subtree: true
});

// Add CSS for better visibility
const style = document.createElement('style');
style.textContent = `
    .date-highlight {
        background-color: ${HIGHLIGHT_COLOR} !important;
        padding: 2px !important;
        border-radius: 3px !important;
        display: inline-block !important;
    }
`;
document.head.appendChild(style);

// Debug info
console.log('Date highlighter script loaded and running');

})();

[Wasay21]

Need help please anyone with experience can check and reply