The copyright notice on a work establishes a claim to copyright. The date on the notice establishes how far back the claim is made. This means if you update the date, you are no longer claiming the copyright for the original date and that means if somebody has copied the work in the meantime and they claim its theirs on the ground that their publishing the copy was before your claim, then it will be difficult to establish who is the originator of the work.
对于企业而言，Google 不会更新其版权日期，因为他们不关心他们于 1999 年开始并于今年更新的某些页面是否在 2094 年或 2109 年落入公共领域。不，你为什么要这么做？ （作为一名 Google 员工，现在是一名前 Google 员工，我被告知这也是内部源代码的政策。）
There is no reason at all for an individual to update the copyright year, because in the U.S. and Europe the life of copyright is the life of the author plus 70 years (50 years in some other countries like Canada and Australia). Extending the date does not extend the copyright. This also applies when a page has multiple contributors none of which are corporations.
As for corporations, Google doesn't update their copyright dates because they don't care whether some page they started in 1999 and updated this year falls into the public domain in 2094 or 2109. And if they don't, why should you? (As a Googler, now an ex-Googler, I was told this was the policy for internal source code as well.)
You do not have to put anything about copyright on your page - copyright automatically applies until you explicitly license it otherwise. Copyright also applies for a preset number of years as determined by international treaties. I do not know what the exact number of years is, but it is a lot, so there is absolutely no point in updating the year in your copyright notice.
Technically, you should update a copyright year only if you made contributions to the work during that year. So if your website hasn't been updated in a given year, there is no ground to touch the file just to update the year.
It is important to recognize that the copyright laws have changed and that for non-US sources, especially after the USA joining the Berne Convention on March 1, 1989, copyright registration in not necessary for enforcement of a copyright notice.
The U.S. Copyright Act, 17 U.S.C. §§ 101 - 810, is Federal legislation enacted by Congress under its Constitutional grant of authority to protect the writings of authors. See U.S. Constitution, Article I, Section 8. Changing technology has led to an ever expanding understanding of the word "writings." The Copyright Act now reaches architectural design, software, the graphic arts, motion pictures, and sound recordings. See § 106. As of January 1, 1978, all works of authorship fixed in a tangible medium of expression and within the subject matter of copyright were deemed to fall within the exclusive jurisdiction of the Copyright Act regardless of whether the work was created before or after that date and whether published or unpublished. See § 301. See also preemption.
The owner of a copyright has the exclusive right to reproduce, distribute, perform, display, license, and to prepare derivative works based on the copyrighted work. See § 106. The exclusive rights of the copyright owner are subject to limitation by the doctrine of "fair use." See § 107. Fair use of a copyrighted work for purposes such as criticism, comment, news reporting, teaching, scholarship, or research is not copyright infringement. To determine whether or not a particular use qualifies as fair use, courts apply a multi-factor balancing test. See § 107.
Copyright protection subsists in original works of authorship fixed in any tangible medium of expression from which they can be perceived, reproduced, or otherwise communicated, either directly or with the aid of a machine or device. See § 102. Copyright protection does not extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery. For example, if a book is written describing a new system of bookkeeping, copyright protection only extends to the author's description of the bookkeeping system; it does not protect the system itself. See Baker v. Selden, 101 U.S. 99 (1879).
According to the Copyright Act of 1976, registration of copyright is voluntary and may take place at any time during the term of protection. See § 408. Although registration of a work with the Copyright Office is not a precondition for protection, an action for copyright infringement may not be commenced until the copyright has been formally registered with the Copyright Office. See § 411.
Deposit of copies with the Copyright Office for use by the Library of Congress is a separate requirement from registration. Failure to comply with the deposit requirement within three months of publication of the protected work may result in a civil fine. See § 407. The Register of Copyrights may exempt certain categories of material from the deposit requirement.
In 1989 the U.S. joined the Berne Convention for the Protection of Literary and Artistic Works. In accordance with the requirements of the Berne Convention, notice is no longer a condition of protection for works published after March 1, 1989. This change to the notice requirement applies only prospectively to copies of works publicly distributed after March 1, 1989.
The Berne Convention also modified the rule making copyright registration a precondition to commencing a lawsuit for infringement. For works originating from a Berne Convention country, an infringement action may be initiated without registering the work with the U.S. Copyright Office. However, for works of U.S. origin, registration prior to filing suit is still required.
The federal agency charged with administering the act is the Copyright Office of the Library of Congress. See § 701 of the act. Its regulations are found in Parts 201 - 204 of title 37 of the Code of Federal Regulations."
I don't think they are reprinting paper books each year. The copyright of the year when the book was printed is valid in all next years.
The same principle should apply to web pages, too. However "the year when website was created" is a bit different. So, if you make changes to your web site - you are not done yet. Hence, when updating the site, you may want to update the copyright year.
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作品的版权声明确立了版权主张。通知上的日期确定了提出索赔的时间。这意味着，如果您更新日期，您将不再主张原始日期的版权，这意味着如果有人同时复制了该作品，并且他们声称其属于自己，因为他们发布该副本是在您提出主张之前，那么很难确定谁是该作品的创作者。
因此，如果权利要求基于普通法版权（未正式注册），则日期应为首次发布日期。如果权利要求是注册版权，则日期应为注册中权利要求的日期。如果作品被大幅修改，您可以通过添加另一个具有较新日期的版权声明或在现有声明中添加附加日期（如“© 2000、2010”）来对修订后的作品提出新的版权声明。同样，添加的日期确定了该声明是在修订后多久之前提出的。
The copyright notice on a work establishes a claim to copyright. The date on the notice establishes how far back the claim is made. This means if you update the date, you are no longer claiming the copyright for the original date and that means if somebody has copied the work in the meantime and they claim its theirs on the ground that their publishing the copy was before your claim, then it will be difficult to establish who is the originator of the work.
Therefore, if the claim is based on common law copyright (not formally registered), then the date should be the date of first publication. If the claim is a registered copyright, then the date should be the date claimed in the registration. In cases where the work was substantially revised you may establish a new copyright claim to the revised work by adding another copyright notice with a newer date or by adding an additional date to the existing notice as in "© 2000, 2010". Again, the added date establishes how far back the claim is made on the revision.
个人根本没有理由更新版权年份，因为在美国和欧洲，版权寿命是作者的寿命加上70年（在加拿大和澳大利亚等其他一些国家是50年）。延长日期并不延长版权。当一个页面有多个贡献者且其中没有一个是公司时，这也适用。
对于企业而言，Google 不会更新其版权日期，因为他们不关心他们于 1999 年开始并于今年更新的某些页面是否在 2094 年或 2109 年落入公共领域。不，你为什么要这么做？ （作为一名 Google 员工，现在是一名前 Google 员工，我被告知这也是内部源代码的政策。）
There is no reason at all for an individual to update the copyright year, because in the U.S. and Europe the life of copyright is the life of the author plus 70 years (50 years in some other countries like Canada and Australia). Extending the date does not extend the copyright. This also applies when a page has multiple contributors none of which are corporations.
As for corporations, Google doesn't update their copyright dates because they don't care whether some page they started in 1999 and updated this year falls into the public domain in 2094 or 2109. And if they don't, why should you? (As a Googler, now an ex-Googler, I was told this was the policy for internal source code as well.)
你的强迫症是罪魁祸首:)
你不必在你的页面上放置任何有关版权的内容——版权会自动应用，除非你明确许可它。版权还适用于国际条约规定的预设年限。我不知道确切的年数是多少，但已经很多了，所以更新版权声明中的年份绝对没有意义。
Your OCD is to blame :)
You do not have to put anything about copyright on your page - copyright automatically applies until you explicitly license it otherwise. Copyright also applies for a preset number of years as determined by international treaties. I do not know what the exact number of years is, but it is a lot, so there is absolutely no point in updating the year in your copyright notice.
从技术上讲，仅当您在该年对作品做出了贡献时，才应更新版权年份。因此，如果您的网站在给定年份没有更新，则没有理由仅仅为了更新年份而触摸该文件。
Technically, you should update a copyright year only if you made contributions to the work during that year. So if your website hasn't been updated in a given year, there is no ground to touch the file just to update the year.
重要的是要认识到版权法已经发生变化，对于非美国来源，特别是在美国于 1989 年 3 月 1 日加入《伯尔尼公约》之后，版权注册不再是执行版权声明所必需的。
这里是康奈尔大学法学院的简历（2015年3月4日复制自 https://www.law.cornell.edu/wex/copyright：
“版权
版权：概述
It is important to recognize that the copyright laws have changed and that for non-US sources, especially after the USA joining the Berne Convention on March 1, 1989, copyright registration in not necessary for enforcement of a copyright notice.
Here is a resumé quoted from the Cornell University Law School (copied on March 4, 2015 from https://www.law.cornell.edu/wex/copyright:
"Copyright
copyright: an overview
版权应截至发布之日。
因此，如果它是静态内容（例如您链接到的《纽约时报》文章），它可能应该受静态版权保护。
如果是动态生成的内容，则其版权应为当年
Copyright should be up to the date of publish.
So, if it's a static content (such as the Times article you linked to), it should probably be statically copyrighted.
If it's dynamically generated content, it should be copyrighted to the current year
我不认为他们每年都会重印纸质书籍。本书印刷当年的版权在以后的所有年份均有效。
同样的原则也应该适用于网页。然而，“网站创建年份”有点不同。因此，如果您对网站进行更改，那么您还没有完成。因此，在更新网站时，您可能需要更新版权年份。
I don't think they are reprinting paper books each year. The copyright of the year when the book was printed is valid in all next years.
The same principle should apply to web pages, too. However "the year when website was created" is a bit different. So, if you make changes to your web site - you are not done yet. Hence, when updating the site, you may want to update the copyright year.