Update 04/14/2018:
Faster performance using the two new libraries , have removed some code related to libraries no longer used. Everything is working: ESP8266 server website and the hosted website are both online!
Current version of the "NTP_Web_Interface.ino" has been renamed to: "Fast_Time_Web_Interface_v5.ino."
More than a Data Logger; also allows fast, remote downloading of files stored onboard in the SPIFFS memory, files are browser enabled and selectable from files list. Both ESP8266, local server and hosted web server are available from the same sketch. Commented out are two useful features; a LCD display function and a Audio beep to alert for a predetermined difference in a 15 minute interval of barometric pressure (experimental).
Same board that is online has been used for development of project coding; therefore, there may be gaps in the data logs! The 15 minute interval has been "spot on" every 15 minutes from the top of the hour. Awesome, for no real time clock. All time related requirements are provided by NTP time server. Even has a backup time server!
Two websites;one sketch:
WiFi Client/Server Based --ESP8266 Domain Hosted, WiFi Client.Server Based --ESP8266 Restrictions from free hosting service is why there is no file browser. Graphing of four weather parameters are availble on both websites.
William