Add new config values to SL1 zip file config.ini

All requested config values are written into SL1 ini file inside the zip

* TIme.hpp and Time.cpp is now part of libslic3r instead of libslic3r_gui
* Updated time manipulation function: separate timestamp_local_str and timestamp_utc_str
* timestamp_utc_str is used in header_slic3r_generated(). Gcode now contains UTC timestamps

src/libslic3r/Time.cpp

@@ -0,0 +1,118 @@
+#include "Time.hpp"
+
+#include <iomanip>
+#include <sstream>
+#include <chrono>
+
+//#include <boost/date_time/local_time/local_time.hpp>
+//#include <boost/chrono.hpp>
+
+
+#ifdef WIN32
+	#define WIN32_LEAN_AND_MEAN
+	#include <windows.h>
+	#undef WIN32_LEAN_AND_MEAN
+#endif /* WIN32 */
+
+namespace Slic3r {
+namespace Utils {
+
+namespace  {
+
+// FIXME: after we switch to gcc > 4.9 on the build server, please remove me
+#if defined(__GNUC__) && __GNUC__ <= 4
+std::string put_time(const std::tm *tm, const char *fmt)
+{
+    static const constexpr int MAX_CHARS = 200;
+    char out[MAX_CHARS];
+    std::strftime(out, MAX_CHARS, fmt, tm);
+    return out;
+}
+#else
+auto put_time(const std::tm *tm, const char *fmt) -> decltype (std::put_time(tm, fmt))
+{
+    return std::put_time(tm, fmt);
+}
+#endif
+
+}
+
+time_t parse_time_ISO8601Z(const std::string &sdate)
+{
+	int y, M, d, h, m, s;
+	if (sscanf(sdate.c_str(), "%04d%02d%02dT%02d%02d%02dZ", &y, &M, &d, &h, &m, &s) != 6)
+        return time_t(-1);
+	struct tm tms;
+    tms.tm_year = y - 1900;  // Year since 1900
+	tms.tm_mon  = M - 1;     // 0-11
+	tms.tm_mday = d;         // 1-31
+	tms.tm_hour = h;         // 0-23
+	tms.tm_min  = m;         // 0-59
+	tms.tm_sec  = s;         // 0-61 (0-60 in C++11)
+#ifdef WIN32
+	return _mkgmtime(&tms);
+#else /* WIN32 */
+	return timegm(&tms);
+#endif /* WIN32 */
+}
+
+std::string format_time_ISO8601Z(time_t time)
+{
+	struct tm tms;
+#ifdef WIN32
+	gmtime_s(&tms, &time);
+#else
+	gmtime_r(&time, &tms);
+#endif
+	char buf[128];
+	sprintf(buf, "%04d%02d%02dT%02d%02d%02dZ",
+    	tms.tm_year + 1900,
+		tms.tm_mon + 1,
+		tms.tm_mday,
+		tms.tm_hour,
+		tms.tm_min,
+		tms.tm_sec);
+	return buf;
+}
+
+std::string format_local_date_time(time_t time)
+{
+	struct tm tms;
+#ifdef WIN32
+	// Converts a time_t time value to a tm structure, and corrects for the local time zone.
+	localtime_s(&tms, &time);
+#else
+	localtime_r(&time, &tms);
+#endif
+    char buf[80];
+ 	strftime(buf, 80, "%x %X", &tms);
+    return buf;
+}
+
+time_t get_current_time_utc()
+{    
+    using clk = std::chrono::system_clock;
+    return clk::to_time_t(clk::now());
+}
+
+static std::string tm2str(const std::tm *tm, const char *fmt)
+{
+    std::stringstream ss;
+    ss << put_time(tm, fmt);
+    return ss.str();
+}
+
+std::string time2str(const time_t &t, TimeZone zone, const char *fmt)
+{
+    std::string ret;
+    
+    switch (zone) {
+    case TimeZone::local: ret = tm2str(std::localtime(&t), fmt); break;
+    case TimeZone::utc:   ret = tm2str(std::gmtime(&t), fmt) + " UTC"; break;
+    }
+    
+    return ret;
+}
+
+}; // namespace Utils
+}; // namespace Slic3r