दिनांक कैलकुलेटर - तिथियों के बीच दिन, आयु और कार्य दिवस

// Calculate days between two dates
const start = new Date('2024-01-01');
const end = new Date('2024-12-31');
const diffMs = end.getTime() - start.getTime();
const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
console.log(`${diffDays} days`); // 365 days

// Add days to a date
const date = new Date('2024-03-15');
date.setDate(date.getDate() + 90);
console.log(date.toISOString().split('T')[0]); // 2024-06-13

// Calculate age
const birthday = new Date('1990-05-15');
const today = new Date();
let age = today.getFullYear() - birthday.getFullYear();
const m = today.getMonth() - birthday.getMonth();
if (m < 0 || (m === 0 && today.getDate() < birthday.getDate())) age--;
console.log(`Age: ${age}`);