Expiration Date Calculator › 30-Day Expiration

30-Day Expiration Date

Find the date 30 days after a start date, the classic one-month window for returns, free trials and short-dated stock.

30 days from a date
days
Expires
Expiration dateAugust 9, 2026
Days remaining30 days left
Day of the weekSunday

30 days from today, 7/10/2026, is August 9, 2026, a Sunday.

Quick answer
Thirty days is the everyday one-month expiry: a return window, a free trial, a deposit deadline or a short-dated product. This adds 30 calendar days to the start date, weekends included, and shows the expiry date, the weekday and how many days are left from today. It is a fixed count of days, not a calendar month, which can be 28 to 31 days.

How it works

expiration = start date + 30 daysadded on the calendar, weekends included
start date
the day the clock starts
30 days
the fixed window
expiration
the day it lapses

A "30-day return" usually means 30 calendar days from purchase or delivery, so check which date the seller counts from.

Frequently asked questions

How do I find a 30-day expiration?

Enter the start date and the tool adds 30 days to it.

Is 30 days a month?

It is close, but a fixed 30 days differs from a calendar month of 28 to 31 days.

Does a 30-day trial include weekends?

Yes, it counts every calendar day, weekends included.

When does a 30-day return start?

Usually from purchase or delivery; the seller decides, so confirm the start date.

Related calculators
Quick facts
Adds
30 days
Common for
returns, trials
Vs a month
not identical
Counts
calendar days