Don't cast the 'm' query variable to an integer as the value can exceed the range of a 32-bit signed integer.

props Viper007Bond.
fixes #24884.

Built from https://develop.svn.wordpress.org/trunk@25138


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WP_Date_Query.

props Viper007Bond.
see #18694.

Built from https://develop.svn.wordpress.org/trunk@25139


git-svn-id: http://core.svn.wordpress.org/trunk@25119 1a063a9b-81f0-0310-95a4-ce76da25c4cd