+<h3> The range expression</h3>
+<pre>
+ date:<since>..<until>
+
+ The above expression restricts the results to only messages from
+ <since> to <until>, based on the Date: header.
+
+ <since> and <until> can describe imprecise times, such as "yesterday".
+ In this case, <since> is taken as the earliest time it could describe
+ (the beginning of yesterday) and <until> is taken as the latest time it
+ could describe (the end of yesterday). Similarly, date:january..febru‐
+ ary matches from the beginning of January to the end of February.
+
+ date:<expr>..! can be used as a shorthand for date:<expr>..<expr>. The
+ expansion takes place before interpretation, and thus, for example,
+ date:monday..! matches from the beginning of Monday until the end of
+ Monday. (Note that entering date:<expr> without "..", for example
+ date:yesterday, won't work, as it's not interpreted as a range expres‐
+ sion at all. Again, use date:yesterday..!)
+
+ Currently, we do not support spaces in range expressions. You can
+ replace the spaces with '_', or (in most cases) '-', or (in some cases)
+ leave the spaces out altogether. Examples in this man page use spaces
+ for clarity.
+
+ Open-ended ranges are supported (since Xapian 1.2.1), i.e. it's possi‐
+ ble to specify date:..<until> or date:<since>.. to not limit the start
+ or end time, respectively. Pre-1.2.1 Xapian does not report an error on
+ open ended ranges, but it does not work as expected either.
+</pre>