EDIT:
Reference is in shipped examples, namely NTP-TZ-DST.ino.

Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: [ESP-12]
• Core Version: [2.7.1]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Nodemcu]
• Flash Mode: [qio|dio|other]
• Flash Size: [4MB]
• lwip Variant: [v2 Lower Memory]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz]
• Upload Using: [OTA AND SERIAL]
• Upload Speed: [115200] (serial upload only)

Problem Description

The follwing two code snippets worked fine with V 2.6.3:

configTime(0, 0, "pool.ntp.org"); setenv("TZ", "CET-1CEST,M3.5.0/02,M10.5.0/03" , 1); 

or, in changed order:

setenv("TZ", "CET-1CEST,M3.5.0/02,M10.5.0/03" , 1); configTime(0, 0, "pool.ntp.org"); 

It always delivered the right local time.
With the current version, this seems to be broken - in a very strange way: Only the first call of the time function delivers the right local time, all following time server calls don't set the local time and the function delivers UTC time only. I read the changelog and searched the issues, but I coludn't find any explanation. Has there been a change regarding the definition of the local timezone or within the setenv function?

If required, here's the complete code of my time function which worked very well with V 2.6.3:

struct tm tm; char timeshow[10]; void getTimeFromServer(){ uint8_t time_retry=0; // Counter retry counts time server setenv("TZ", "CET-1CEST,M3.5.0/02,M10.5.0/03", 1); struct tm initial; // temp struct for checking if year==1970 initial.tm_year=70; while (initial.tm_year == 70 && time_retry < 15) { configTime(0, 0, "pool.ntp.org"); // get time from NTP server (ESP8266) delay(500); time_t now = time(&now); localtime_r(&now, &initial); Serial.print("Time Server connection attempt: "); Serial.println(time_retry + 1); Serial.print("current year: "); Serial.println(1900 + initial.tm_year); time_retry++; } if (time_retry >=15) { Serial.println("Connection to time server failed"); } else { time_t now = time(&now); localtime_r(&now, &tm); strftime (timeshow, sizeof(timeshow), "%H:%M", &tm); Serial.print("Successfully requested current time from server: "); Serial.println(timeshow); } } }