Strictly speaking, every time a text is amended, the particular year should appear in the copyright notice i.e ©2010, 2012 for which case there is a plugin.
The following code features another method without using a plugin.
Use PHP to echo the year
<txp:variable name="year" value='<txp:php>echo safe_strftime("%Y");</txp:php>' /> <txp:if_variable name="year" value='<txp:posted format="%Y" />'> © <txp:variable name="year" /> <txp:else /> © <txp:posted format="%Y" /> - <txp:variable name="year" /> </txp:if_variable>
The code detects if the article was posted this year and would therefore display © 2014.
If it was posted any year before the current year of 2014, then it will display that year and the current one – i.e © 2009 – 2014.
via: txptips by Yiannis Colakides