SVN Tags based on a DATE

Can someone pls let me know how to make a tag or branch based on a certa开发者_如何转开发in date in SVN?

One way is from your working copy, from command line, is as follows:

svn copy -r {date-in-iso-format} destination

For example,

svn copy -r {2011-01-18} http://myserver/svn/project/trunk \
           http://myserver/svn/project/tags/tag-2011-01-18 \
           -m "Tagging project on 18th Jan 2011"