Compare Dates

// Method 1: Compare timestamps
function compareDates(date1, date2) {
    if (date1.getTime() === date2.getTime()) {
        return 0; // Equal
    } else if (date1.getTime() > date2.getTime()) {
        return 1; // date1 is later
    } else {
        return -1; // date1 is earlier
    }
}

const date1 = new Date('2024-01-15');
const date2 = new Date('2024-01-20');
console.log('Compare:', compareDates(date1, date2));

// Method 2: Simple comparisons
console.log('date1 > date2:', date1 > date2);
console.log('date1 < date2:', date1 < date2);
console.log('date1 === date2:', date1.getTime() === date2.getTime());

// Method 3: Check if date is in range
function isDateInRange(date, startDate, endDate) {
    return date >= startDate && date <= endDate;
}

const checkDate = new Date('2024-01-18');
const start = new Date('2024-01-15');
const end = new Date('2024-01-20');
console.log('In range:', isDateInRange(checkDate, start, end));

// Method 4: Check if date is today
function isToday(date) {
    const today = new Date();
    return date.getDate() === today.getDate() &&
           date.getMonth() === today.getMonth() &&
           date.getFullYear() === today.getFullYear();
}

console.log('Is today:', isToday(new Date()));

// Method 5: Check if date is past/future
function isPast(date) {
    return date < new Date();
}

function isFuture(date) {
    return date > new Date();
}

console.log('Is past:', isPast(new Date('2020-01-01')));
console.log('Is future:', isFuture(new Date('2025-01-01')));

// Method 6: Compare dates (ignore time)
function compareDatesOnly(date1, date2) {
    const d1 = new Date(date1.getFullYear(), date1.getMonth(), date1.getDate());
    const d2 = new Date(date2.getFullYear(), date2.getMonth(), date2.getDate());
    return d1.getTime() - d2.getTime();
}

const dateWithTime = new Date('2024-01-15T15:30:00');
const dateWithoutTime = new Date('2024-01-15T00:00:00');
console.log('Same date (ignore time):', compareDatesOnly(dateWithTime, dateWithoutTime) === 0);