107 }
108 if (buffer_length < needed_buffer) {
109 assert(false, "buffer_length too small");
110 return NULL;
111 }
112 // Get the current time
113 jlong milliseconds_since_19700101 = javaTimeMillis();
114 const int milliseconds_per_microsecond = 1000;
115 const time_t seconds_since_19700101 =
116 milliseconds_since_19700101 / milliseconds_per_microsecond;
117 const int milliseconds_after_second =
118 milliseconds_since_19700101 % milliseconds_per_microsecond;
119 // Convert the time value to a tm and timezone variable
120 struct tm time_struct;
121 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) {
122 assert(false, "Failed localtime_pd");
123 return NULL;
124 }
125 #if defined(_ALLBSD_SOURCE)
126 const time_t zone = (time_t) time_struct.tm_gmtoff;
127 #else
128 const time_t zone = timezone;
129 #endif
130
131 // If daylight savings time is in effect,
132 // we are 1 hour East of our time zone
133 const time_t seconds_per_minute = 60;
134 const time_t minutes_per_hour = 60;
135 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour;
136 time_t UTC_to_local = zone;
137 if (time_struct.tm_isdst > 0) {
138 UTC_to_local = UTC_to_local - seconds_per_hour;
139 }
140 // Compute the time zone offset.
141 // localtime_pd() sets timezone to the difference (in seconds)
142 // between UTC and and local time.
143 // ISO 8601 says we need the difference between local time and UTC,
144 // we change the sign of the localtime_pd() result.
145 const time_t local_to_UTC = -(UTC_to_local);
146 // Then we have to figure out if if we are ahead (+) or behind (-) UTC.
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107 }
108 if (buffer_length < needed_buffer) {
109 assert(false, "buffer_length too small");
110 return NULL;
111 }
112 // Get the current time
113 jlong milliseconds_since_19700101 = javaTimeMillis();
114 const int milliseconds_per_microsecond = 1000;
115 const time_t seconds_since_19700101 =
116 milliseconds_since_19700101 / milliseconds_per_microsecond;
117 const int milliseconds_after_second =
118 milliseconds_since_19700101 % milliseconds_per_microsecond;
119 // Convert the time value to a tm and timezone variable
120 struct tm time_struct;
121 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) {
122 assert(false, "Failed localtime_pd");
123 return NULL;
124 }
125 #if defined(_ALLBSD_SOURCE)
126 const time_t zone = (time_t) time_struct.tm_gmtoff;
127 #elif defined(_WIN32) && _MSC_VER > 1800
128 const time_t zone = _timezone;
129 #else
130 const time_t zone = timezone;
131 #endif
132
133 // If daylight savings time is in effect,
134 // we are 1 hour East of our time zone
135 const time_t seconds_per_minute = 60;
136 const time_t minutes_per_hour = 60;
137 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour;
138 time_t UTC_to_local = zone;
139 if (time_struct.tm_isdst > 0) {
140 UTC_to_local = UTC_to_local - seconds_per_hour;
141 }
142 // Compute the time zone offset.
143 // localtime_pd() sets timezone to the difference (in seconds)
144 // between UTC and and local time.
145 // ISO 8601 says we need the difference between local time and UTC,
146 // we change the sign of the localtime_pd() result.
147 const time_t local_to_UTC = -(UTC_to_local);
148 // Then we have to figure out if if we are ahead (+) or behind (-) UTC.
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