我正在尝试使用此格式返回日期
2015-10-07T00：32：50.877 + 0000
我已经测试了
Time.now.iso8601
=> "2015-10-21T09:47:50-04:00"
但我没有相同的格式
TKS
答案 0 :(得分：28)
您可以自己使用strftime并按照here
所述创建所需的格式您指定的格式应为%Y-%m-%dT%H:%M:%S.%L%z
所以完整的Ruby语句将是Time.now.strftime('%Y-%m-%dT%H:%M:%S.%L%z')
各种ISO 8601格式：
%Y%m%d => 20071119 Calendar date (basic)
%F => 2007-11-19 Calendar date (extended)
%Y-%m => 2007-11 Calendar date, reduced accuracy, specific month
%Y => 2007 Calendar date, reduced accuracy, specific year
%C => 20 Calendar date, reduced accuracy, specific century
%Y%j => 2007323 Ordinal date (basic)
%Y-%j => 2007-323 Ordinal date (extended)
%GW%V%u => 2007W471 Week date (basic)
%G-W%V-%u => 2007-W47-1 Week date (extended)
%GW%V => 2007W47 Week date, reduced accuracy, specific week (basic)
%G-W%V => 2007-W47 Week date, reduced accuracy, specific week (extended)
%H%M%S => 083748 Local time (basic)
%T => 08:37:48 Local time (extended)
%H%M => 0837 Local time, reduced accuracy, specific minute (basic)
%H:%M => 08:37 Local time, reduced accuracy, specific minute (extended)
%H => 08 Local time, reduced accuracy, specific hour
%H%M%S,%L => 083748,000 Local time with decimal fraction, comma as decimal sign (basic)
%T,%L => 08:37:48,000 Local time with decimal fraction, comma as decimal sign (extended)
%H%M%S.%L => 083748.000 Local time with decimal fraction, full stop as decimal sign (basic)
%T.%L => 08:37:48.000 Local time with decimal fraction, full stop as decimal sign (extended)
%H%M%S%z => 083748-0600 Local time and the difference from UTC (basic)
%T%:z => 08:37:48-06:00 Local time and the difference from UTC (extended)
%Y%m%dT%H%M%S%z => 20071119T083748-0600 Date and time of day for calendar date (basic)
%FT%T%:z => 2007-11-19T08:37:48-06:00 Date and time of day for calendar date (extended)
%Y%jT%H%M%S%z => 2007323T083748-0600 Date and time of day for ordinal date (basic)
%Y-%jT%T%:z => 2007-323T08:37:48-06:00 Date and time of day for ordinal date (extended)
%GW%V%uT%H%M%S%z => 2007W471T083748-0600 Date and time of day for week date (basic)
%G-W%V-%uT%T%:z => 2007-W47-1T08:37:48-06:00 Date and time of day for week date (extended)
%Y%m%dT%H%M => 20071119T0837 Calendar date and local time (basic)
%FT%R => 2007-11-19T08:37 Calendar date and local time (extended)
%Y%jT%H%MZ => 2007323T0837Z Ordinal date and UTC of day (basic)
%Y-%jT%RZ => 2007-323T08:37Z Ordinal date and UTC of day (extended)
%GW%V%uT%H%M%z => 2007W471T0837-0600 Week date and local time and difference from UTC (basic)
%G-W%V-%uT%R%:z => 2007-W47-1T08:37-06:00 Week date and local time and difference from UTC (extended)
答案 1 :(得分：14)
如果您只想包含小数秒数，可以使用DateTime#iso8601([n=0]) → string：
pry(main)> Time.now.iso8601(3)
=> "2017-01-17T12:31:26.695+11:00"
答案 2 :(得分：7)
似乎主要问题是您希望输出为UTC编码的ISO 8601时间戳，而Ruby默认使用Time值的时区-这很有可能，尤其是在创建值时使用Time.now（您的本地时区）。
解决方案是使用Time方法将#utc值转换为UTC时区：
now = Time.now
# convert to UTC and format
puts now.utc.iso8601
这将输出2020-04-20T20:46:31Z-Z相当于+00:00，并且表示UTC（或美军术语中的“祖鲁时间”）。任何符合ISO-8601的实现都应接受Z与+00:00相同。
iso8601实例上的Time方法是扩展。它是标准库的一部分，但是您必须使用require 'time'显式加载它。这还会为Time类加载其他有用的扩展。
答案 3 :(得分：1)
您尝试过使用Date吗？
Date.new(2018,5,25).iso8601 # returns "2018-05-25"
今天是：
Date.today.iso8601