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输出周几
Thursday

时间标记_随机数
1531963516
1531963516_77421

输出周几、日、月、年,时间,上午或下午
Thursday 19th of July 2018 01:25:16 AM

输出 October 3, 1975 was on 周几
Oct 3, 1975 was on a Friday

在 format 参数中使用常量
Thu, 19 Jul 18 01:25:16 +0000

输出类似:1975-10-03T00:00:00+00:00
1975-10-03T00:00:00+00:00