Facing issue related to Time Sync between RTC time and NTP server time in Arduino ESP32

[Ramesh777]

Hello,

I am using the ESP32 for my project with Arduino IDE.

currently, I am facing the issue related to RTC time sync with NTP server time. Some times, I found that the difference between my current RTC time and current actual UTC time is around more than 20 seconds or more.

For example, current UTC time is 11:12:01 and my current RTC time is 11:12:21. I am not able to understand the root cause behind it.

I am using the implementation from the example code available from FILE->Examples->ESP32->Time-SimpleTime in Arduino IDE

I am using the function configTime(gmtOffset_sec, daylightOffset_sec, ntpServer) to sync the RTC time with NTP server time where daylightOffset_sec = 0 , daylightOffset_sec = 0 and ntpServer = "pool.ntp.org". I am calling it at every 1 hour.

To derive the current RTC time , i am using the getLocalTime(&timeinfo) function.

This offset of the time difference between my current RTC time and actual NTP server time does not become 0 even though configTime function called to sync the Current RTC time with NTP server time.

Please note that my system remains active for 1 minute and remain in low power mode (light sleep mode) for 5 minutes.
Please Let me know if anybody can have some ideas about the issue or have any suggestions about what I am doing wrong.