Terms of Service

Last Updated: December 2025

Welcome to WeekCalc.com. These Terms of Service ("Terms") govern your access to and use of the WeekCalc.com website and all related date and time calculation tools (collectively, the "Service"). By accessing or using our Service, you agree to be bound by these Terms. If you do not agree to these Terms, please do not use the Service.

1. Acceptance of Terms

By accessing WeekCalc.com, you acknowledge that you have read, understood, and agree to be bound by these Terms and our Privacy Policy. These Terms apply to all visitors, users, and others who access or use the Service. We reserve the right to modify these Terms at any time. Changes will be effective immediately upon posting to the website. Your continued use of the Service after changes are posted constitutes your acceptance of the modified Terms.

2. Description of Service

WeekCalc.com provides free, web-based date and time calculation tools including:

• Week Number Calculator - Calculate ISO 8601 week numbers for any date
• Days Between Dates Calculator - Determine the duration between two dates
• Add/Subtract Days Calculator - Calculate future or past dates by adding or subtracting days
• Workday Calculator - Calculate business days excluding weekends
• Birthday Calculator - Calculate exact age and birthday information

All calculations are performed using client-side JavaScript in your web browser. We provide these tools free of charge for informational, educational, and planning purposes only.

3. User Responsibilities and Acceptable Use

When using WeekCalc.com, you agree to:

• Use the Service legally: Comply with all applicable local, state, national, and international laws and regulations.
• Use tools as intended: Utilize our calculators for legitimate date and time calculation purposes only.
• Respect intellectual property: Not copy, modify, distribute, or create derivative works from our content without explicit permission.
• Avoid harmful activities: Not attempt to interfere with, compromise, or disrupt the Service, servers, or networks connected to the Service.
• No automated abuse: Not use bots, scrapers, or automated systems to access the Service in ways that send more requests than a human could reasonably produce.
• Verify critical calculations: Independently verify results for critical business, legal, financial, or medical purposes with appropriate professionals.

4. Intellectual Property Rights

All content on WeekCalc.com, including but not limited to text, graphics, logos, code, design elements, and compilation of content (collectively, "Content"), is the property of WeekCalc.com or its content suppliers and is protected by United States and international copyright, trademark, and other intellectual property laws.

You are granted a limited, non-exclusive, non-transferable license to access and use the Service for personal or internal business purposes. This license does not include the right to:

• Resell or make commercial use of the Service or its Content
• Collect or use product listings, descriptions, or prices for competitive purposes
• Make derivative uses of the Service or its Content
• Download or copy Content except for personal, non-commercial use
• Use data mining, robots, or similar data gathering or extraction methods

5. Disclaimers and Limitations of Liability

No Warranty

THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR ACCURACY.

While we strive to provide accurate calculations using industry-standard algorithms, we do not warrant that:

• The Service will be uninterrupted, timely, secure, or error-free
• The results obtained from the Service will be accurate, complete, or reliable
• The quality of any calculations, information, or materials obtained through the Service will meet your expectations
• Any errors in the software or calculations will be corrected

Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, WEEKCALC.COM AND ITS OFFICERS, DIRECTORS, EMPLOYEES, AND AGENTS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS OR REVENUES, WHETHER INCURRED DIRECTLY OR INDIRECTLY, OR ANY LOSS OF DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES RESULTING FROM:

• Your use or inability to use the Service
• Any reliance on calculations or information obtained through the Service
• Any unauthorized access to or use of our servers or any personal information stored therein
• Any interruption or cessation of the Service
• Any bugs, viruses, or similar harmful components transmitted through the Service
• Any errors or omissions in any content or calculations

6. Indemnification

You agree to defend, indemnify, and hold harmless WeekCalc.com and its officers, directors, employees, contractors, agents, licensors, and suppliers from and against any claims, liabilities, damages, judgments, awards, losses, costs, expenses, or fees (including reasonable attorneys' fees) arising out of or relating to:

• Your violation of these Terms
• Your use of the Service
• Your violation of any rights of another party
• Any reliance on calculations or information obtained through the Service for critical business, legal, financial, or medical decisions

7. Third-Party Links and Services

The Service may contain links to third-party websites or services (such as ISO.org and time.gov) that are not owned or controlled by WeekCalc.com. We have no control over, and assume no responsibility for, the content, privacy policies, or practices of any third-party websites or services. You acknowledge and agree that WeekCalc.com shall not be responsible or liable for any damage or loss caused by or in connection with the use of any third-party content or services.

We display advertisements through Google AdSense and potentially other advertising networks. These third-party ad servers or networks use cookies and other technologies in their advertisements and links. WeekCalc.com has no control over these technologies and is not responsible for the privacy practices of advertisers. Please refer to our Privacy Policy for more information.

8. Appropriate Use for Planning Purposes Only

Our date and time calculators are designed for informational, educational, and general planning purposes. They should not be used as the sole basis for:

• Legal decisions or filings: Statute of limitations, filing deadlines, contract interpretations, or legal age determinations should be verified with qualified legal counsel.
• Financial calculations: Investment decisions, interest calculations, loan terms, or payment schedules should be confirmed with financial professionals and official systems.
• Medical determinations: Age-based dosing, treatment protocols, or health screening schedules should be verified with licensed healthcare providers.
• Critical business operations: Mission-critical project deadlines, SLA compliance, or regulatory filings should be verified with authoritative systems and appropriate professionals.

While our calculators use industry-standard algorithms and are regularly tested for accuracy, for critical applications, always verify results with official sources, professional advisors, and authoritative systems.

9. Termination

We reserve the right to terminate or suspend access to our Service immediately, without prior notice or liability, for any reason, including without limitation if you breach these Terms. Upon termination, your right to use the Service will immediately cease. All provisions of these Terms which by their nature should survive termination shall survive, including ownership provisions, warranty disclaimers, indemnity, and limitations of liability.

10. Governing Law and Dispute Resolution

These Terms shall be governed by and construed in accordance with the laws of the United States, without regard to its conflict of law provisions. Any dispute arising out of or relating to these Terms or the Service shall be resolved through binding arbitration in accordance with the rules of the American Arbitration Association, except that either party may seek injunctive or other equitable relief in any court of competent jurisdiction.

You agree that any claim or cause of action arising out of or related to the Service must be filed within one (1) year after such claim or cause of action arose, or it shall be forever barred.

11. Severability

If any provision of these Terms is found to be unenforceable or invalid under any applicable law, such unenforceability or invalidity shall not render these Terms unenforceable or invalid as a whole. Such provisions shall be deleted without affecting the remaining provisions herein.

12. No Waiver

Our failure to enforce any right or provision of these Terms will not be considered a waiver of those rights. Any waiver of any provision of these Terms will be effective only if in writing and signed by an authorized representative of WeekCalc.com.

13. Entire Agreement

These Terms, together with our Privacy Policy, constitute the entire agreement between you and WeekCalc.com regarding the use of the Service, superseding any prior agreements between you and WeekCalc.com relating to your use of the Service.

14. Contact Information

If you have any questions about these Terms of Service, please contact us through our Contact Us page.

By using WeekCalc.com, you acknowledge that you have read, understood, and agree to be bound by these Terms of Service.