+ if s then
+ local year, month, day, hour, min, sec, tzd;
+ year, month, day, hour, min, sec, tzd = s:match("^(%d%d%d%d)-?(%d%d)-?(%d%d)T(%d%d):(%d%d):(%d%d)%.?%d*([Z+%-].*)$");
+ if year then
+ local time_offset = os_difftime(os_time(os_date("*t")), os_time(os_date("!*t"))); -- to deal with local timezone
+ local tzd_offset = 0;
+ if tzd ~= "" and tzd ~= "Z" then
+ local sign, h, m = tzd:match("([+%-])(%d%d):?(%d*)");
+ if not sign then return; end
+ if #m ~= 2 then m = "0"; end
+ h, m = tonumber(h), tonumber(m);
+ tzd_offset = h * 60 * 60 + m * 60;
+ if sign == "-" then tzd_offset = -tzd_offset; end
+ end
+ sec = (sec + time_offset) - tzd_offset;
+ return os_time({year=year, month=month, day=day, hour=hour, min=min, sec=sec, isdst=false});
+ end
+ end