Solr查询中的NOW / DAY如何工作？

Question

I am trying to figure out why Solr thinks an doc is in the past. My query is set up to use

published:[* TO NOW/DAY]

The doc I am hoping it will find has a published date of

2012-04-30T04:00:00Z

Current Solr server time is Mon Apr 30 18:26:47 EDT 2012. My understanding says that the document should have been found by now, which makes me think the NOW/DAY doesn't work the way I think it does. Does anybody know how the NOW/DAY evaluates dates and why when Solr is not finding my doc when I add that stipulation?

Answer 1

NOW/DAY means take the actual date time and round it to the day (leaving out the time). Of course if the actual date is 2012-04-30 , any hour, the result is 2012-04-30T00:00:00Z .

Answer 2

Try just using NOW. I suspect that NOW/DAY is equal to 2012-04-30T00:00:00Z.

Answer 3

NOW/DAY rounds down to midnight last night. If you want the midnight of current day change with NOW+1DAY/DAY .

Date Math Syntax

Date math expressions consist either adding some quantity of time in a specified unit, or rounding the current time by a specified unit. expressions can be chained and are evaluated left to right.

For example: this represents a point in time two months from now:

NOW+2MONTHS

This is one day ago:

NOW-1DAY

A slash is used to indicate rounding. This represents the beginning of the current hour:

NOW/HOUR

The following example computes (with millisecond precision) the point in time six months and three days into the future and then rounds that time to the beginning of that day:

NOW+6MONTHS+3DAYS/DAY

Note that while date math is most commonly used relative to NOW it can be applied to any fixed moment in time as well:

1972-05-20T17:33:18.772Z+6MONTHS+3DAYS/DAY

Quoted from Apache Solr Reference Guide - Working with Dates