Question: generating date ranges when using find utility

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http://ubuntuforums.org – Hello, Using the -atime -mtime or -ctime tests in the find utility returns information about files that were accessed, modified or changed N 24 hour periods ago. Does anyone know how to use time utilities to generate arguments to these tests that specify particular dates? One could use a calender and a calculator to compute the number of days between the desired date and the current time. But, section 6.6 'Relative Times in Date Strings' in the find info pages explain a scheme of expressions for specifying relative times. The problem is that the expressions are valid arguments to the d (Hardware)