语法: str = ngx.http_time(sec)
环境: init_worker_by_lua, set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.**
返回一个可以用在 http 头部时间的格式化字符串（例如，在 Last-Modified 头的使用）。参数 sec 是以秒为单位的时间戳（比如 ngx.time 的返回）。
ngx.say(ngx.http_time(1290079655))
-- yields "Thu, 18 Nov 2010 11:27:35 GMT"English source:
syntax: str = ngx.http_time(sec)
context: init_worker_by_lua, set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.**
Returns a formated string can be used as the http header time (for example, being used in Last-Modified header). The parameter sec is the time stamp in seconds (like those returned from ngx.time).
ngx.say(ngx.http_time(1290079655))
-- yields "Thu, 18 Nov 2010 11:27:35 GMT"