Add 30 Days to Date Calculator
Calculate exactly 30 days from any starting date. This common calculation is essential for billing cycles, payment terms, subscription renewals, and legal deadlines. Our calculator handles month transitions and leap years automatically.
Common 30-Day Uses
| Use Case | Starting Point | Example | Net-30 invoicesInvoice dateDue date calculation Trial periodsSignup dateTrial expiration Return policiesPurchase dateReturn deadline Prescription refillsLast fill dateRefill date | Monthly billing | Bill date | Next payment |
Add 30 Days Calculator
``javascript
function add30Days(startDate) {
const start = new Date(startDate);
const result = new Date(start);
result.setDate(result.getDate() + 30);
return {
startDate: start.toLocaleDateString('en-US', {
weekday: 'long', year: 'numeric', month: 'long', day: 'numeric'
}),
resultDate: result.toLocaleDateString('en-US', {
weekday: 'long', year: 'numeric', month: 'long', day: 'numeric'
}),
dayOfWeek: result.toLocaleDateString('en-US', { weekday: 'long' }),
daysAdded: 30
};
}
``
30 Days vs. One Month
Note that 30 days is not the same as "one month." January 15 + 30 days = February 14, but January 15 + 1 month = February 15. For legal and financial purposes, "30 days" usually means exactly 30 days, while "one month" follows calendar months. Clarify which applies to your situation.
Business Days Consideration
If you need 30 business days (excluding weekends), the calendar result will be approximately 42 calendar days. Some legal and business contexts specify "business days"—always verify which calculation applies to your deadline.