补充日期函数的基础使用方法 #315
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补充日期函数的基础使用方法 #315
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介绍 ngx.today, ngx.time, ngx.utctime, ngx.localtime, ngx.now, ngx.http_time，以及 ngx.cookie_time 基本使用办法以及其原理
关键点：
事实上，在 Nginx/Openresty 中，会经常使用到获取时间操作，通常一次请求最少有几十次获取时间操作，当单核心 RPS/QPS 达到 10K 以上时，获取时间操作往往会达到 200K+量级的调用，是一个非常高频的调用。所以 Nginx 会将时间和日期进行缓存，并非每次调用或每次请求获取时间和日期。
推荐 使用 ngx_lua 模块提供的带缓存的时间接口，如
ngx.today,ngx.time,ngx.utctime,ngx.localtime,ngx.now,ngx.http_time，以及ngx.cookie_time等。ref:
#312