blocks|key|417693|text|日期：-d+@526276800+"%2B%25m/%25d/%25y“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

blocks|key|417728|text|在我的盒上，我使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417729|date+-r+526276800+%2B%25m/%25d/%25y|code-block|syntax|javascript|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|I|8|@]|9|@]|A|$E|F]]]|G|$]]

On my Mac OS X box, I use:

<pre><code>date -r 526276800 +%m/%d/%y
</code></pre>

blocks|key|4155968|text|GNU日期：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4155969|日期-d+'1970-01-01+946684800秒|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

With GNU date:

date -d '1970-01-01 946684800 seconds'

blocks|key|417865|text|或者在Ruby中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417866|%25+ruby+-e+'puts+Time.now.to_f'
1243620267.8988

%25+ruby+-e+'puts+Time.now.to_i'
1243620267

%25+ruby+-e+'puts+Time.at+1243620270'
Fri+May+29+11:04:30+-0700+2009

%25+ruby+-e+'puts+Time.at(1243620270).strftime+"at+%25I:%25M%25p"'
at+11:04AM|code-block|syntax|javascript|417867|以下是strftime格式，摘自ruby+Time类文档：|offset|length|style|CODE|417868|++%25a+-+The+abbreviated+weekday+name+(``Sun'')
++%25A+-+The++full++weekday++name+(``Sunday'')
++%25b+-+The+abbreviated+month+name+(``Jan'')
++%25B+-+The++full++month++name+(``January'')
++%25c+-+The+preferred+local+date+and+time+representation
++%25d+-+Day+of+the+month+(01..31)
++%25H+-+Hour+of+the+day,+24-hour+clock+(00..23)
++%25I+-+Hour+of+the+day,+12-hour+clock+(01..12)
++%25j+-+Day+of+the+year+(001..366)
++%25m+-+Month+of+the+year+(01..12)
++%25M+-+Minute+of+the+hour+(00..59)
++%25p+-+Meridian+indicator+(``AM''++or++``PM'')
++%25S+-+Second+of+the+minute+(00..60)
++%25U+-+Week++number++of+the+current+year,
++++++++++starting+with+the+first+Sunday+as+the+first
++++++++++day+of+the+first+week+(00..53)
++%25W+-+Week++number++of+the+current+year,
++++++++++starting+with+the+first+Monday+as+the+first
++++++++++day+of+the+first+week+(00..53)
++%25w+-+Day+of+the+week+(Sunday+is+0,+0..6)
++%25x+-+Preferred+representation+for+the+date+alone,+no+time
++%25X+-+Preferred+representation+for+the+time+alone,+no+date
++%25y+-+Year+without+a+century+(00..99)
++%25Y+-+Year+with+century
++%25Z+-+Time+zone+name
++%25%25+-+Literal+``%25''+character|entityMap^0|0|0|3|8|L|4|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@$I|S|J|T|K|L]|$I|U|J|V|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|W|8|@]|9|@]|A|$E|F]]]|O|$]]

Or in Ruby:

<pre><code>% ruby -e 'puts Time.now.to_f'
1243620267.8988

% ruby -e 'puts Time.now.to_i'
1243620267

% ruby -e 'puts Time.at 1243620270'
Fri May 29 11:04:30 -0700 2009

% ruby -e 'puts Time.at(1243620270).strftime "at %I:%M%p"'
at 11:04AM
</code></pre>

Here are the <code>strftime</code> formats, taken from the ruby <code>Time</code> class documentation:

<pre><code> %a - The abbreviated weekday name (``Sun'')
 %A - The full weekday name (``Sunday'')
 %b - The abbreviated month name (``Jan'')
 %B - The full month name (``January'')
 %c - The preferred local date and time representation
 %d - Day of the month (01..31)
 %H - Hour of the day, 24-hour clock (00..23)
 %I - Hour of the day, 12-hour clock (01..12)
 %j - Day of the year (001..366)
 %m - Month of the year (01..12)
 %M - Minute of the hour (00..59)
 %p - Meridian indicator (``AM'' or ``PM'')
 %S - Second of the minute (00..60)
 %U - Week number of the current year,
 starting with the first Sunday as the first
 day of the first week (00..53)
 %W - Week number of the current year,
 starting with the first Monday as the first
 day of the first week (00..53)
 %w - Day of the week (Sunday is 0, 0..6)
 %x - Preferred representation for the date alone, no time
 %X - Preferred representation for the time alone, no date
 %y - Year without a century (00..99)
 %Y - Year with century
 %Z - Time zone name
 %% - Literal ``%'' character
</code></pre>

blocks|key|417882|text|$+perl+-le+'print+scalar+localtime+1243620900'
Fri+May+29+11:15:00+2009|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|entityMap^0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$B|C]]]|D|$]]

<pre><code>$ perl -le 'print scalar localtime 1243620900'
Fri May 29 11:15:00 2009
</code></pre>

blocks|key|417680|text|这可能有点麻烦，但是在perl中有一个名为DateTime的伟大模块，它可以在各种日期和时间格式(包括纪元)之间来回转换。使用起来非常简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417681|http://datetime.perl.org/|offset|length|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|P|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@$D|N|E|O|1|P]]|A|$]]]|F|$G|$5|H|I|J|A|$K|C]]]]

It may be a little heavy duty, but in perl there's a great module called DateTime that'll convert back and forth between a myriad of date &amp; time formats, including epoch. It's very simple to use: 

<a href="http://datetime.perl.org/" rel="nofollow noreferrer">http://datetime.perl.org/</a>

blocks|key|4155914|text|就我个人而言，我使用Python和bash作为替代。但是，既然你对它很恼火;-)我会做一个小脚本，把日期作为参数，然后编写它，这样就有了-2历元和-2个正常选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4155915|这样，您就可以从时代转换为正常的|4155916|./script.sh+--2normal+1243609635|code-block|syntax|javascript|4155917|另一种情况是|4155918|./script+--2epoch+"20090529+17:07"|4155919|输入日期总是以相同的方式格式化吗？这样脚本编写起来就容易多了。|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|S|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|T|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|U|8|@]|9|@]|A|$]]]|O|$]]

Personally, I alternatively use Python and bash for this. But since you are annoyed with it ;-) I'd go for making a small script that takes a date as a parameter and write it so as to have --2epoch and --2normal options.

That way, you can convert from epoch to normal with

<pre><code>./script.sh --2normal 1243609635
</code></pre>

and the other way around with

<pre><code>./script --2epoch "20090529 17:07"
</code></pre>

Is the input date always formatted the same way? That would make the script a lot easier to write.

blocks|key|417816|text|Perl一行程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417817|$+perl+-MDate::Manip+-le+'print+UnixDate(ParseDateString(“划时代”.shift()，“%25c”))‘946684800|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

Perl one-liner:

$ perl -MDate::Manip -le 'print UnixDate(ParseDateString("epoch ".shift()),"%c")' 946684800

I often find myself needing to convert from one type of time to another, and haven't found a way I'm consistently happy with. Every time I do a quick google search, I come up with different (sometimes painfully complex) answers.

I'm happy with

<pre><code>date -d "Sep 5 1986" "+%s"
</code></pre>

for converting a standard date to epoch time, but I can't seem to make the reverse work (and the man pages I've browsed aren't helping much.)

<pre><code>date -d "526276800" "+%m/%d/%y"
</code></pre>

yields an error on my RHEL 5 install.

Can the community offer me some strategies for easily converting back and forth? I'll take all forms: awk, perl, date. What are the pros and cons of each method?

Converting to and from epoch time

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我经常发现自己需要从一种时间转换到另一种时间，而且我还没有找到一种我一直满意的方式。每次我快速搜索谷歌时，我都会想出不同的答案(有时非常复杂)。我很高兴date -d "Sep 5 1986" "+%s"用于将标准日期转换为划时代的时间，但我似乎无法使其反向工作(而且我浏览过的手册页对此帮助不大)。date -d "526276800" "+%m/%d/%y"在我的RHEL 5安装上产生一个错误。

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