Hi. I've noticed that I'm unable to notmuch search using date with unix
timestamps (ie number of seconds since Jan 1st 1970 UTC). I get a xapian
error. The notmuch man pages state that searching using
'date:<initial-timestamp>..<final-timestamp>'
where "each timestamp is a number representing the number of seconds since
1970-01-01 00:00:00 UTC" is supported, so I'm wondering what's wrong with
my installation.

* notmuch config get built_with.field_processor
true
* xapian-config - xapian-core 1.4.4
* notmuch 0.26+8~ga727e7d

Here's an example:

# date +%s
1517238733

# date -d @1517238733
Mon Jan 29 15:12:13 GMT 2018

# date -d @1517152333
Sun Jan 28 15:12:13 GMT 2018


# notmuch search date:1517152333..1517238733
notmuch search: A Xapian exception occurred
A Xapian exception occurred parsing query: Didn't understand date
specification '1517152333..1517238733'
Query string was: date:1517152333..1517238733

Yet I can do:

# notmuch search date:yesterday..today
or
# notmuch search date:1/28/2018..1/29/2018
or
# notmuch search date:20180128..20180129

..and all show 216 results.

Any thoughts as to why Xapian doesn't like this type of query? Is it just
me? :-)

Thanks,
--  Matt