blocks|key|4532978|text|更具体地回答您的问题(尽管我非常感谢Onorio推荐使用Timex!)，您可以使用:calendar.universal_time()或:calendar.local_time()从Erlang标准库获取当前日期和时间。在calendar模块中，有许多用于处理Erlang的datetime类型的有用函数，但它们都有一定的局限性，并且没有提供任何用于解析或格式化日期的功能，而这正是Timex的用武之地。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4532979|entityMap^0|15|Q|1W|M|33|8|3T|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

To answer your question more specifically (though I really appreciate Onorio's recommendation to use Timex!), you can get the current date and time from the Erlang standard lib using <code>:calendar.universal_time()</code> or <code>:calendar.local_time()</code>. There are a number of useful functions for working with Erlang's <code>datetime</code> type in the <code>calendar</code> module, but they are somewhat limited, and don't provide you with anything for parsing or formatting dates, which is where Timex comes in.

blocks|key|4533093|text|来自Erlang+19.1：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4533094|:os.system_time(:millisecond)|code-block|syntax|javascript|4533095|来自Erlang+18：|4533096|:os.system_time(:milli_seconds)|4533097|提供当前UNIX时间戳UTC。|4533098|感谢@HenrikN链接博客帖子http://michal.muskala.eu/2015/07/30/unix-timestamps-in-elixir.html|offset|length|4533099|entityMap|0|LINK|mutability|MUTABLE|url|http://michal.muskala.eu/2015/07/30/unix-timestamps-in-elixir.html^0|0|0|0|0|0|G|1U|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

From Erlang 19.1:

<pre><code>:os.system_time(:millisecond)
</code></pre>

From Erlang 18:

<pre><code>:os.system_time(:milli_seconds)
</code></pre>

Gives the current UNIX timestamp UTC.

Thanks @HenrikN for linking the blog post <a href="http://michal.muskala.eu/2015/07/30/unix-timestamps-in-elixir.html" rel="noreferrer">http://michal.muskala.eu/2015/07/30/unix-timestamps-in-elixir.html</a>

blocks|key|25353|text|我认为您最好的选择是使用Paul+Schoenfelder(又名BitWalker)的timex库来开发Elixir。库在这里：https://github.com/bitwalker/timex，您可以从hex.pm+https://hex.pm/packages/timex获取包。Paul在github+repo的自述文件页面上很好地解释了如何使用该库。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|25354|您可以调用本地的Erlang库，但我认为当处理Elixir时，Paul的库更好。|25355|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/bitwalker/timex|1|https://hex.pm/packages/timex^0|1S|Y|0|32|T|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

I think your best bet is to use Paul Schoenfelder's (aka BitWalker) timex library for Elixir. The lib is here: <a href="https://github.com/bitwalker/timex">https://github.com/bitwalker/timex</a> and you can get the package from hex.pm <a href="https://hex.pm/packages/timex">https://hex.pm/packages/timex</a>. Paul kindly provided a good explanation of how to use the library on the readme page of that github repo.

You could make calls to the native Erlang libs but I think Paul's lib is superior when one is dealing with Elixir.

blocks|key|4533148|text|这取决于你想要它的格式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4533149|您可以使用Elixir中的Erlang标准库中的任何函数。传统上，您可以使用now/0函数获取时间：|offset|length|style|CODE|4533150|iex(1)>+:erlang.now
{1487,+549978,+29683}|code-block|syntax|javascript|4533151|这代表time_t+1,487,549,978.29683，即世界协调时2017年2月20日(星期一)午夜过后19分38.29683秒。|4533152|但是，自从Erlang/OTP+18以来，该函数就被弃用了；原因之一是Erlang保证每次调用时返回值都会增加。如果在机器上的紧密循环中调用它的速度足够快，以至于每微秒调用一次以上，则返回的时间戳将领先于实时。|4533153|替代方案是an+API+with+more+precision+and+control。这个新接口的主要接口是os:system_time/0函数，它以系统定义的单位返回纪元时间：|4533154|iex(2)>+:os.system_time
1487549978296838000|4533155|不过，您可以使用system_time/1请求特定的单元：|4533156|iex(3)>+:os.system_time(:millisecond)
1487549978296|4533157|从Elixir1.2开始，这些函数也可以在原生System+module中使用|4533158|iex(4)>+System.system_time(:second)
1487549978|4533159|要获得更友好但仍然是Elixir原生的界面，请使用calendar模块，它将为您提供元组：|4533160|iex(5)>+:calendar.universal_time
{{2017,+2,+20},+{0,+19,+38}}|4533161|从1.3开始，Elixir也有了自己的一套用于操作日期和时间的模块：Date和DateTime。您可以使用它的函数来获取当前日期或时间，如下所示：|4533162|iex(6)>+Date.utc_today
~D[2017-02-20]
iex(7)>+DateTime.utc_now
#DateTime<2017-02-20+00:19:38.29683Z>|4533163|entityMap|0|LINK|mutability|MUTABLE|url|http://erlang.org/doc/man/erlang.html#now-0|1|http://erlang.org/doc/apps/erts/time_correction.html|2|http://erlang.org/doc/man/os.html#system_time-0|3|https://hexdocs.pm/elixir/System.html#content|4|http://erlang.org/doc/man/calendar.html|5|https://hexdocs.pm/elixir/Date.html#content|6|https://hexdocs.pm/elixir/DateTime.html#content^0|0|12|5|12|5|0|0|0|3|6|0|0|1J|G|5|12|1|1J|G|2|0|0|8|D|0|0|N|6|N|D|3|0|0|P|8|P|8|4|0|0|Y|4|13|8|Y|4|5|13|8|6|0|0^^$0|@$1|2|3|4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1V|8|@$D|1W|E|1X|F|G]]|9|@$D|1Y|E|1Z|1|20]]|A|$]]|$1|H|3|I|5|J|7|21|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|22|8|@$D|23|E|24|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|25|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|26|8|@$D|27|E|28|F|G]]|9|@$D|29|E|2A|1|2B]|$D|2C|E|2D|1|2E]]|A|$]]|$1|S|3|T|5|J|7|2F|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|2G|8|@$D|2H|E|2I|F|G]]|9|@]|A|$]]|$1|W|3|X|5|J|7|2J|8|@]|9|@]|A|$K|L]]|$1|Y|3|Z|5|6|7|2K|8|@$D|2L|E|2M|F|G]]|9|@$D|2N|E|2O|1|2P]]|A|$]]|$1|10|3|11|5|J|7|2Q|8|@]|9|@]|A|$K|L]]|$1|12|3|13|5|6|7|2R|8|@$D|2S|E|2T|F|G]]|9|@$D|2U|E|2V|1|2W]]|A|$]]|$1|14|3|15|5|J|7|2X|8|@]|9|@]|A|$K|L]]|$1|16|3|17|5|6|7|2Y|8|@$D|2Z|E|30|F|G]|$D|31|E|32|F|G]]|9|@$D|33|E|34|1|35]|$D|36|E|37|1|38]]|A|$]]|$1|18|3|19|5|J|7|39|8|@]|9|@]|A|$K|L]]|$1|1A|3|-4|5|6|7|3A|8|@]|9|@]|A|$]]]|1B|$1C|$5|1D|1E|1F|A|$1G|1H]]|1I|$5|1D|1E|1F|A|$1G|1J]]|1K|$5|1D|1E|1F|A|$1G|1L]]|1M|$5|1D|1E|1F|A|$1G|1N]]|1O|$5|1D|1E|1F|A|$1G|1P]]|1Q|$5|1D|1E|1F|A|$1G|1R]]|1S|$5|1D|1E|1F|A|$1G|1T]]]]

It depends what format you want it in.
You can use any function in the Erlang standard library from Elixir. Traditionally, you would get the time with the <a href="http://erlang.org/doc/man/erlang.html#now-0" rel="nofollow noreferrer"><code>now/0</code></a> function:
<pre><code>iex(1)&gt; :erlang.now
{1487, 549978, 29683}
</code></pre>
That represents <code>time_t</code> 1,487,549,978.29683, which is 19 minutes, 38.29683 seconds after midnight UTC on Monday, Feb 20, 2017.
However, since Erlang/OTP 18, that function is deprecated; one of the reasons is that Erlang guarantees that the return value will increase every call. If calling it in a tight loop on a machine fast enough to call it more than once per microsecond, the returned timestamp will get ahead of real time.
The replacement is <a href="http://erlang.org/doc/apps/erts/time_correction.html" rel="nofollow noreferrer">an API with more precision and control</a>. The primary interface to this new API is the <a href="http://erlang.org/doc/man/os.html#system_time-0" rel="nofollow noreferrer"><code>os:system_time/0</code></a> function, which returns epoch time in a system-defined unit:
<pre><code>iex(2)&gt; :os.system_time
1487549978296838000
</code></pre>
You can request a specific unit with <code>system_time/1</code>, though:
<pre><code>iex(3)&gt; :os.system_time(:millisecond)
1487549978296
</code></pre>
Since Elixir 1.2, those functions have also been available in the native <a href="https://hexdocs.pm/elixir/System.html#content" rel="nofollow noreferrer"><code>System</code> module</a>:
<pre><code>iex(4)&gt; System.system_time(:second)
1487549978
</code></pre>
For a more friendly but still Elixir-native interface, use the <a href="http://erlang.org/doc/man/calendar.html" rel="nofollow noreferrer"><code>calendar</code></a> module, which will give you tuples:
<pre><code>iex(5)&gt; :calendar.universal_time
{{2017, 2, 20}, {0, 19, 38}}
</code></pre>
Since 1.3, Elixir has also had its own suite of modules for manipulating dates and times: <a href="https://hexdocs.pm/elixir/Date.html#content" rel="nofollow noreferrer"><code>Date</code></a> and <a href="https://hexdocs.pm/elixir/DateTime.html#content" rel="nofollow noreferrer"><code>DateTime</code></a>. You can use its functions to get the current date or time like so:
<pre><code>iex(6)&gt; Date.utc_today
~D[2017-02-20]
iex(7)&gt; DateTime.utc_now
#DateTime&lt;2017-02-20 00:19:38.29683Z&gt;
</code></pre>

blocks|key|25586|text|获取毫秒数(Unix时间戳)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|25587|DateTime.utc_now()+%7C>+DateTime.to_unix(:millisecond)|code-block|syntax|javascript|25588|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To get the number of milliseconds (Unix Timestamp):

<pre><code>DateTime.utc_now() |&gt; DateTime.to_unix(:millisecond)
</code></pre>

blocks|key|4533026|text|您也可以使用从UTC返回{megaseconds,+seconds,+microseconds}的:os.timestamp\0。现在，:os.timestamp+%7C>+:calendar.now_to_datetime将以erlang标准{{YYYY,+MM,+DD},+{HH,+MM,+SS}}格式提供给您。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4533027|entityMap^0|C|10|1D|F|1W|16|3C|U|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

You can also use <code>:os.timestamp\0</code>, which returns <code>{megaseconds, seconds, microseconds}</code> from UTC. <code>:os.timestamp |&gt; :calendar.now_to_datetime</code> will give you now in erlang standard <code>{{YYYY, MM, DD}, {HH, MM, SS}}</code> format.

blocks|key|4533070|text|如果您需要处理夏令时或时区，我为此创建了一个库：Calendar。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4533071|要获取当前时间，您可以使用例如，洛杉矶的当前时间为Calendar.DateTime.now("America/Los_Angeles")，或者协调世界时的当前时间为Calendar.DateTime.now_utc。|style|CODE|4533072|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/lau/calendar^0|O|8|0|0|P|18|2B|P|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]|$A|W|B|X|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

If you need to deal with Daylight Saving Time or time zones I made a library for that: <a href="https://github.com/lau/calendar" rel="nofollow">Calendar</a>.

To get the current time you would use for instance <code>Calendar.DateTime.now("America/Los_Angeles")</code> for the current time in Los Angeles or <code>Calendar.DateTime.now_utc</code> for the current time in UTC.

blocks|key|25550|text|获取unix时间戳|type|unstyled|depth|inlineStyleRanges|entityRanges|data|25551|DateTime.to_unix(DateTime.utc_now)|code-block|syntax|javascript|25552|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To get unix timestamp

<pre><code>DateTime.to_unix(DateTime.utc_now)
</code></pre>

blocks|key|25621|text|好的，Timex通常可以帮助你，但是下面的一些技巧可能会有所帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|25622|{erl_date,+erl_time}+=+:calendar.local_time()
#+{{2020,+11,+19},+{0,+6,+36}}

{:ok,+time}+=+Time.from_erl(erl_time)
#+{:ok,+~T[00:06:36]}

{:ok,+date}+=+Date.from_erl(erl_date)
#+{:ok,+~D[2020-11-19]}

Calendar.strftime(time,+"%25c",+preferred_datetime:+"%25H:%25M:%25S")
#+"00:06:36"


Calendar.strftime(date,+"%25c",+preferred_datetime:+"%25m-%25d-%25Y")
#+"11-19-2020"|code-block|syntax|javascript|25623|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Well, Timex to the rescue usually, however some of tricks below might be of help:
<pre><code>{erl_date, erl_time} = :calendar.local_time()
# {{2020, 11, 19}, {0, 6, 36}}

{:ok, time} = Time.from_erl(erl_time)
# {:ok, ~T[00:06:36]}

{:ok, date} = Date.from_erl(erl_date)
# {:ok, ~D[2020-11-19]}

Calendar.strftime(time, &quot;%c&quot;, preferred_datetime: &quot;%H:%M:%S&quot;)
# &quot;00:06:36&quot;


Calendar.strftime(date, &quot;%c&quot;, preferred_datetime: &quot;%m-%d-%Y&quot;)
# &quot;11-19-2020&quot;
</code></pre>

This seems like a really dumb question but how does one get and display the current date or time in Elixir? I tried going through <a href="https://hexdocs.pm/elixir/" rel="noreferrer" title="Elixir 1.4 documentation">the docs</a> but couldn't find anything. Do I need to use an Erlang function?

Getting the current date and or time in Elixir

Erlang

Unix

这似乎是一个非常愚蠢的问题，但是如何在Elixir中获取和显示当前日期或时间呢？我试着通过搜索，但什么也找不到。我需要使用Erlang函数吗？

问获取Elixir中的当前日期和/或时间
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