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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_3t0f6vn0fqljtafka9ts109o6c, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
srecord TimestampRange(Timestamp start, Timestamp end) {
  *(long start, long end) {
    this(Timestamp(start), Timestamp(end));
  }
  
  Timestamp start aka startTime() { ret start; }
  Timestamp end aka endTime() { ret end; }
  
  selfType start aka startTime(Timestamp start) { this.start = start; this; }
  selfType end aka endTime(Timestamp end) { this.end = end; this; }
  
  bool complete() { ret start != null && end != null; }
  
  Duration duration() { ret !complete() ? null : end.minusAsDuration(start); }
}