Hi
It could be.
I would search https://bugreports.qt.io/secure/Dashboard.jspa
for info.

@SGaist

And function update_vars() is:

151 static void 152 internal_function 153 update_vars (void) 154 { 155 __daylight = tz_rules[0].offset != tz_rules[1].offset; 156 __timezone = -tz_rules[0].offset; 157 __tzname[0] = (char *) tz_rules[0].name; 158 __tzname[1] = (char *) tz_rules[1].name; 159 160 /* Keep __tzname_cur_max up to date. */ 161 size_t len0 = strlen (__tzname[0]); 162 size_t len1 = strlen (__tzname[1]); 163 if (len0 > __tzname_cur_max) 164 __tzname_cur_max = len0; 165 if (len1 > __tzname_cur_max) 166 __tzname_cur_max = len1; 167 }

@Rondog Ah.. Sorry. I was careless. I read source and saw that

#ifndef Q_OS_WINRT #define QT_USE_REGISTRY_TIMEZONE 1 #endif

All be ok and work correct on Windows XP. Sorry guys