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I have this compilation error:

TimeSerial.ino:68:29: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
   if(Serial.find(TIME_HEADER)) {

                         ^

Please replace this line:
#define TIME_HEADER "T" // Header tag for serial time sync message

with this line:
#define TIME_HEADER 'T' // Header tag for serial time sync message

and compilation goes well.