Safari History.db history_visits.visit_time的格式是什么？ [英] What format is the Safari History.db history_visits.visit_time in?

问题描述

从Safari查看History.db时，有一个名为 history_visits 的表，该表具有名为 visit_time 的列，这是 REAL 的值。它具有诸如 470799793.096987 的值。那是什么格式？我希望以12/08/2015 05:12:05这样的格式查看它。

When looking at the History.db from Safari, there's a table named history_visits which has a column named visit_time, which is a REAL value. It has values such as 470799793.096987. What format is that in? I'd like to see it in a format such as 12/08/2015 05:12:05.

推荐答案

自2001年1月1日00:00:00 UTC以来的秒数。它必须来自 NSDate 。

It's the number in seconds since 00:00:00 UTC on 1 January 2001. It must be coming from an NSDate.

NSDate对象封装单个时间点，独立于任何特定的日历系统或时区。日期对象是不可变的，代表相对于绝对参考日期的不变时间间隔（2001年1月1日世界标准时间00:00:00）。

NSDate objects encapsulate a single point in time, independent of any particular calendrical system or time zone. Date objects are immutable, representing an invariant time interval relative to an absolute reference date (00:00:00 UTC on 1 January 2001).

— NSDate类参考

要从中获得体面的人类价值，您必须添加 978307200 （2001-01-01 00:00的时代） ：00）。

To get a decent human value out of it, you must add 978307200 (the epoch for 2001-01-01 00:00:00).

此查询应为您提供所需的内容：

This query should give you what you want:

.headers on

select datetime(v.visit_time + 978307200, 'unixepoch', 'localtime') as date, v.visit_time + 978307200 as epoch, v.visit_time, i.domain_expansion, i.url
from history_items i left join history_visits v on i.id = v.history_item
order by i.id desc
limit 100;

示例输出：

date|epoch|visit_time|domain_expansion|url
2015-12-31 11:51:27|1451562687.28465|473255487.284646|duckduckgo|https://duckduckgo.com/?q=current+timestamp+2015-12-31+11:51&t=osx

PS：仅用于将来的参考资料，Safari的db文件位于〜/ Library / Safari / History.db

这篇关于Safari History.db history_visits.visit_time的格式是什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！