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

Basic Infos

• This issue complies with theissue POLICY doc.
• I have read the documentation atreadthedocs 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);     }  }}