The 15 calendar days until your result contain — business days. Because 15 days is 2 weeks plus 1 day, it contains either 10 or 11 business days depending on which day of the week you start. A notable conversion: 15 business days always equals exactly 21 calendar days — three full calendar weeks — when starting on any weekday.

Relative Dates — Including 15 Days Ago From Today

The table below shows key reference dates and what date falls 15 days from each. The 15 days ago from today row is useful when verifying whether an FMLA certification request, a lease default notice, or a commercial cure period issued in the past 15 days is still within its response window.

Date Calculator — Any Interval From Any Date

Calculate any number of days, weeks, or months from any starting date. Leave the date blank to count from today.

15 Days From a Custom Start Date

Enter any past or future date to find the date exactly 15 days from it. This is most commonly used to find the FMLA certification deadline from the date a request was made, the end of a commercial lease cure period from the date of default notice, or the close of an USCIS premium processing window from a petition filing date.

15 Business Days From Today Calculator

15 business days from today equals exactly 21 calendar days — three full calendar weeks — when starting on any weekday. This clean three-week equivalence makes 15 business days one of the most predictable business-day intervals to work with, and is the reason USCIS chose it as the premium processing guarantee: it maps neatly onto three weekly workflow cycles within a government agency. The calculator below shows the exact date alongside the 15-calendar-day result.

Countdown to Your 15-Day Deadline

Tracking an FMLA certification deadline, a lease cure period, or an immigration petition window? The real-time countdown below updates every 30 seconds and shows exactly how much time remains until the 15-day mark.

Add Your 15-Day Deadline to Your Calendar

Save the exact 15-day deadline to Google Calendar or download a .ics file for Apple Calendar or Outlook. Both are pre-filled with the correct date automatically.

Why 15 Days From Today Matters: Real-World Use Cases and Legal Rules

Fifteen is the midpoint of thirty — exactly half a month, the boundary between the first and second halves of any calendar month, and the interval that anchors semi-monthly payroll schedules for tens of millions of US workers. But 15 days from today also carries specific legal weight in federal employment law, immigration, commercial property, and consumer protection contexts where the 15-day window is not chosen by convention but mandated by statute or regulation.

FMLA Medical Certification: The Federal 15-Calendar-Day Deadline

Under the Family and Medical Leave Act and its implementing regulation at 29 CFR 825.305, when an employer requests medical certification to support an employee’s FMLA leave claim, the employee has exactly 15 calendar days from the date of the employer’s request to provide the completed certification. This is not 15 business days — it is 15 calendar days, meaning weekends count and the deadline is the date shown at the top of this page if the request was made today.

The employer may grant additional time beyond 15 days if circumstances prevent timely submission — for example, if the certifying healthcare provider is unavailable. However, the employer is not required to do so. Failure to provide certification within the 15-day window may result in the employer denying FMLA leave. For employees, missing this deadline can mean losing federally protected job rights. For HR administrators, issuing the certification request today means the response deadline is exactly the date shown above. The 15-day clock starts on the date the request is provided to the employee, not the date the leave began.

USCIS Premium Processing: 15 Business Days for Immigration Petitions

USCIS premium processing is a paid expedite service available for certain immigration petition types including H-1B, L-1, O-1, TN, and I-140 petitions. When premium processing is requested, USCIS guarantees an adjudication decision — approval, denial, request for evidence (RFE), or notice of intent to deny — within 15 business days of receipt of the premium processing request. If USCIS fails to act within 15 business days, they must refund the premium processing fee.

The 15-business-day clock starts on the date USCIS receives and receipts the premium processing request, not the date it is mailed. Because 15 business days equals exactly three calendar weeks, the expected decision date is three weeks from the receipt notice date — use the 15 Business Days calculator above to find the exact date. An RFE pauses the 15-business-day clock; a new 15-business-day window begins when USCIS receives the response to the RFE. Premium processing fees as of 2025 are $2,805 for most petition types and $1,685 for certain categories.

Semi-Monthly Payroll: The 15-Day Pay Cycle

Semi-monthly payroll divides the calendar year into exactly 24 pay periods, typically with payment on the 1st and 15th of each month, or the 15th and last day of the month. This creates pay periods of either 15 or 16 calendar days depending on the month — longer in months with 31 days, shorter in February. Semi-monthly payroll is particularly common for salaried professional and white-collar employees, and is used by a significant proportion of US employers as a middle ground between bi-weekly (26 periods) and monthly (12 periods).

The key practical difference between semi-monthly and bi-weekly payroll is that semi-monthly always produces 24 paychecks per year at a fixed calendar date, while bi-weekly produces 26 paychecks at a shifting calendar date. For employees paid semi-monthly on the 1st and 15th, knowing the exact date 15 days from today tells them when the next pay period begins, which anchors expense reporting cycles, direct deposit schedules, and benefit deduction timings throughout the year.

Commercial Lease Default Cure Periods: 15 Days to Remedy

Commercial lease agreements across the US almost universally include a cure or remedy period — a window after notice of default during which the tenant can fix the problem before the landlord can exercise termination rights. For non-monetary defaults (maintenance violations, prohibited uses, insurance lapses), the cure period is most commonly 15 to 30 calendar days in standard commercial lease forms including those published by BOMA (Building Owners and Managers Association) and NAIOP.

For monetary defaults such as failure to pay rent, cure periods are shorter — typically 3 to 5 business days — but for structural or operational defaults, 15 days is standard. If a landlord serves a notice of default today citing a non-monetary breach, the tenant typically has until the date shown at the top of this page to remedy the breach and avoid lease termination proceedings. Commercial tenants who fail to cure within the stated period lose their right to contest the default in many states. The cure period clock starts on the date the notice is received, not the date of default.

State Eviction Notices: 15-Day Quit or Pay Windows

While many US states use 3-day or 5-day pay-or-quit notices for non-payment of residential rent, a number of states use longer windows that include or approach 15 days. Massachusetts requires 14 days notice before filing for non-payment eviction. Wisconsin requires 5 days for non-payment but 30 days for lease violations. For holdover tenancies (tenant remaining after lease expiration), many states require between 10 and 30 days notice to quit, with 15 days being common for month-to-month tenancies where the original lease specified 15-day termination notice.

For commercial evictions, 15-day notices are used in Texas for non-payment and in several other states for various lease violations. The calculation of when is 15 days from today is therefore directly relevant to both landlords serving notices and tenants calculating how long they have to respond or vacate. As with residential notices, the clock typically starts the day after notice is served under FRCP 6(a)-style exclusive counting.

Mortgage Servicing: 15-Day Grace Periods and Response Windows

Under federal mortgage servicing rules implementing the Real Estate Settlement Procedures Act (RESPA) and enforced by the Consumer Financial Protection Bureau, mortgage servicers face several 15-day response obligations. A servicer must send a written acknowledgement within 5 business days of receiving a qualified written request (QWR) from a borrower, but must provide a substantive response within 30 business days — with a 15-business-day extension available in complex cases.

Additionally, most standard mortgage agreements include a grace period of 15 calendar days for late payment before a late fee can be assessed. This means a borrower whose payment was due on the 1st of the month has until the 16th (15 days later) to pay without incurring a late charge. The 15-day mortgage grace period is one of the most commonly searched date calculations among homeowners, making knowing what is 15 days from today directly relevant to millions of monthly mortgage payment cycles.

15 Days: Exactly Half of 30 and the 15-Business-Day = 3-Week Conversion

15 calendar days from today is exactly half of 30 calendar days — a relationship that makes the 15-day interval useful as a midpoint check in any 30-day process. If a 30-day notice was served 15 days ago, exactly half the period has elapsed. If a net-30 invoice is 15 days old, it is exactly halfway to its due date. This midpoint property is why semi-monthly payroll uses the 1st and 15th as payment dates — they divide the month as evenly as a fixed calendar date can.

The business-day equivalent has an equally clean property: 15 business days equals exactly 21 calendar days (three full calendar weeks) when starting on any weekday Monday through Friday. This makes 15 business days one of the most predictable business-day-to-calendar-day conversions available — unlike 10 business days (12-14 calendar days, variable) or 30 business days (42-44 calendar days, variable), 15 business days always lands on the same day of the week as the start date, exactly three weeks later.

15 Days From Today Including Today — Does the Count Start Today?

This calculator uses the standard exclusive convention: today is day zero, tomorrow is day one, and the 15th day is the result shown above. This matches the FMLA regulation, FRCP 6(a), and the majority of commercial and statutory contexts.

The one significant exception is the USCIS premium processing window, where USCIS begins its 15-business-day count from the date the petition is receipted — making that date day one rather than day zero. Under this inclusive reading, the 15th business day falls one business day earlier than the exclusive result shown in the calculator above. For USCIS purposes, subtract one business day from the 15 Business Days result shown above to find the earliest date USCIS could act under premium processing.

If you need 15 days from today including today — where today is day one and you want the 15th day — the result is 14 calendar days from now: calculating….

Quick Reference: 15 Days From Today, Tomorrow, and 15 Days Ago

What is 15 days from today? The exact date is shown at the top of the page, updated daily. What is the date 15 days from today in different country formats? Use the date format selector above. When is 15 days from today in day-of-week terms? It always falls one day later in the week than today — Monday becomes Tuesday, Friday becomes Saturday. 15 days from tomorrow is 16 calendar days from today. 15 days ago from today is useful for checking whether an FMLA request, lease notice, or premium processing receipt is still within its 15-day response window.

Frequently Asked Questions

What is 15 days from today?

15 days from today is exactly two weeks and one day from now — shown in real time at the top of this page and updated automatically every day. It is the FMLA medical certification deadline when a request is made today, the midpoint of any 30-day period that started today, and the boundary of the first semi-monthly payroll period. Because 15 days is two weeks plus one day, the result always falls one day later in the week than today.

When is 15 days from today?

The exact date is displayed at the top of this page. Fifteen days from today always lands one day later in the week than today: if today is Monday the result is Tuesday, if today is Thursday the result is Friday, and if today is Saturday the result is Sunday. This one-day advancement means day 15 falls on a weekend slightly more often than a 14-day period, making the weekend-extension question worth checking for court and regulatory deadlines.

How many business days is 15 calendar days?

15 calendar days contains either 10 or 11 business days depending on which day of the week you start. Starting on Monday gives 11 business days within the 15-day window. Starting on any other weekday gives 10 business days. This variability is because 15 days is two weeks plus one extra day, meaning the bonus day may or may not fall on a weekday depending on your start.

What is 15 business days from today?

15 business days from today equals exactly 21 calendar days — three full calendar weeks — when starting on any weekday. This clean three-week equivalence makes 15 business days straightforward to calculate mentally: simply add three weeks to today’s date. It is the USCIS premium processing guarantee window, meaning your immigration petition decision is due within three calendar weeks of the premium processing receipt date.

What is 15 days from today including today?

If today is counted as day one, the 15th day falls 14 calendar days from now — the same result as the standard 14-day calculator. The result is: the same date shown on the 14-days-from-today page. For most statutory and regulatory purposes the exclusive convention applies (today is day zero), making the result shown at the top of this page the correct deadline. For USCIS premium processing, the inclusive convention applies and the effective last day is one business day earlier than the exclusive result.

What is 15 days from tomorrow?

15 days from tomorrow is 16 calendar days from today. This applies when a formal request, notice, or triggering document was received today but the 15-day response window begins the following day. Under FMLA regulations, for example, if an employer provides a certification request form to an employee today after business hours, some interpretations begin the 15-day window from the next business day rather than today.

What is the FMLA 15-day certification rule?

Under 29 CFR 825.305, an employee must provide a completed medical certification to their employer within 15 calendar days of the employer’s written request. The 15-day clock begins on the date the employer provides the certification request form to the employee. The employer may extend this deadline if circumstances beyond the employee’s control prevent timely submission, but is not required to do so. Failure to provide certification on time may result in denial of FMLA leave and loss of federal job protection rights.

How long does USCIS premium processing take?

USCIS guarantees an adjudication decision within 15 business days of receiving a premium processing request, which equals exactly 21 calendar days from the receipt date. If USCIS issues a request for evidence (RFE), the 15-business-day clock pauses and restarts when USCIS receives the RFE response. If USCIS fails to act within 15 business days without issuing an RFE or notice of intent to deny, the agency must refund the premium processing fee and continue to adjudicate the petition. Use the 15 Business Days calculator above to find your expected decision date.

What is the 15-day mortgage grace period?

Most standard mortgage agreements allow a 15-calendar-day grace period after the official payment due date before a late fee is assessed. For a mortgage due on the 1st of each month, the grace period typically expires on the 16th day of the month (day 1 being the due date, with the 15th additional day being the last day to pay without a late charge). This is distinct from the point at which a missed payment is reported to credit bureaus, which typically occurs after 30 days of non-payment rather than at the end of the grace period.

Does a 15-day deadline extend if it falls on a weekend?

For court and regulatory deadlines governed by FRCP 6(a) or equivalent state rules, a 15-day period that ends on a Saturday, Sunday, or federal holiday extends to the next business day. Because 15 days advances one day in the weekly cycle, you can predict whether a weekend extension applies: if today is Sunday, 15 days from today is a Monday, so no extension; if today is Saturday, 15 days is a Sunday, triggering an extension to the following Monday. For private contracts, lease cure periods, and payroll cycles, weekends do not extend the deadline unless the agreement specifically provides otherwise.