[eschwartz]

From the manual:

If the date is ambiguous, the current locale is used for date comparison. For example, in an mm/dd/yyyy locale 2/1/2009 is interpreted as 1 Feb 2009. In a dd/mm/yyyy locale it is interpreted as 2 Jan 2009. Some special date strings are available. The string "today" translates to today’s date, whatever it is. The strings "yesterday" and "thismonth" (or the translated equivalent in the current language) also work. In addition, the string "daysago" (also translated) can be used to compare to a date some number of days ago. For example:

date:>10daysago
date:<=45daysago