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输出周几
Wednesday

时间标记_随机数
1534305572
1534305572_49361

输出周几、日、月、年,时间,上午或下午
Wednesday 15th of August 2018 03:59:32 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
Wed, 15 Aug 18 03:59:32 +0000

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