On Wed, Sep 12 2012, Jani Nikula wrote:
> Add a custom value range processor to enable date and time searches of
> the form date:since..until, where "since" and "until" are expressions
> understood by the previously added date/time parser, to restrict the
> results to messages within a particular time range (based on the Date:
> header).
>
> If "since" or "until" describes date/time at an accuracy of days or
> less, the values are rounded according to the accuracy, towards past
> for "since" and towards future for "until". For example,
> date:november..yesterday would match from the beginning of November
> until the end of yesterday. Expressions such as date:today..today
> means since the beginning of today until the end of today.

IMO this is totally unintuitive and not how the range should work.
date:foo..bar should return messages whose date >= foo and < bar.  So
for instance date:november..yesterday should return messages whose date
is > 2012/11/01 00:00:00 and < 2012/09/12 00:00:00.  So to get
yesterdays messages one would do: date:yesterday..today.

> Open-ended ranges are supported (since Xapian 1.2.1), i.e. you can
> specify date:..until or date:since.. to not limit the start or end
> date, respectively.
>
> CAVEATS:
>
> Xapian does 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.

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