### CONTEXT (Previous Events):
<system_output timestamp="859.615803"/>
<user_input timestamp="859.648921">[D</user_input>
<system_output timestamp="859.656104"/>
<user_input timestamp="859.689689">[D</user_input>
<system_output timestamp="859.696451"/>
<user_input timestamp="859.729518">[D</user_input>
<system_output timestamp="859.737325"/>
<user_input timestamp="859.76996">[D</user_input>
<system_output timestamp="859.77648"/>
<user_input timestamp="859.810128">[D</user_input>
<system_output timestamp="859.81715"/>
<user_input timestamp="860.270251">[D</user_input>
<system_output timestamp="860.272142"/>
<user_input timestamp="860.473447">[D</user_input>

### TARGET LINE (Extract and Classify THIS Timestamp):
<system_output timestamp="860.478354"/>

Answer: 860.478354, old event