ESP8266 Community Forum

Is there any way to get accurate time on an ESP8266. By accurate, I mean correct to < 0.1 seconds.

The only obvious way to do this is using NTP. I tried using the ntp_client library written by Michael Margolis and using configtime() but both these approaches result in a time about two seconds slow.

Keeping the time is no issue but I cannot set it sufficiently accurately.

There has been an addition two days ago that may help. uSeconds has been included in the settimeofday() function. I don't know how this will affect getting a more accurate time but it is encouraging.

https://github.com/esp8266/Arduino/pull/4001

See the bottom of https://github.com/esp8266/Arduino/issues/1679

https://github.com/esp8266/Arduino/tree ... NTP-TZ-DST

Afaik it is only a sntp client, so no subsecond or transport delay compensation.

I'm hoping someone will take it further.