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系统到现在多少秒
local time = os.time()
print( time )
给定时间的时，分，秒
local test = os.data( "%X", time)
"%X"是转换格式，类似与lua string中的formart。时间格式如下：
%a | abbreviated weekday name (e.g., Wed) |
%A | full weekday name (e.g., Wednesday) |
%b | abbreviated month name (e.g., Sep) |
%B | full month name (e.g., September) |
%c | date and time (e.g., 09/16/98 23:48:10) |
%d | day of the month (16) [01-31] |
%H | hour, using a 24-hour clock (23) [00-23] |
%I | hour, using a 12-hour clock (11) [01-12] |
%M | minute (48) [00-59] |
%m | month (09) [01-12] |
%p | either "am" or "pm" (pm) |
%S | second (10) [00-61] |
%w | weekday (3) [0-6 = Sunday-Saturday] |
%x | date (e.g., 09/16/98) |
%X | time (e.g., 23:48:10) |
%Y | full year (1998) |
%y | two-digit year (98) [00-99] |
%% | the character '%' |
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原文链接：https://blog.csdn.net/wodehao0808/article/details/115364197