### CONTEXT (Previous Events):
<system_output timestamp="1583.1043">Unpacking xz-utils (5.4.1-0.2) ...
</system_output>
<system_output timestamp="1583.296956">Selecting previously unselected package bc.
</system_output>
<system_output timestamp="1583.299617">Preparing to unpack .../009-bc_1.07.1-3_i386.deb ...
</system_output>
<system_output timestamp="1583.29997">Unpacking bc (1.07.1-3) ...
</system_output>
<system_output timestamp="1583.374811">Selecting previously unselected package binutils-common:i386.
</system_output>
<system_output timestamp="1583.37723">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="1583.377698">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="1584.311808">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="1584.314218">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="1584.314835">Unpacking libbinutils:i386 (2.40-2) ...
</system_output>
<system_output timestamp="1584.479868">Selecting previously unselected package libctf-nobfd0:i386.
</system_output>
<system_output timestamp="1584.482351">Preparing to unpack .../012-libctf-nobfd0_2.40-2_i386.deb ...
</system_output>
<system_output timestamp="1584.48353">Unpacking libctf-nobfd0:i386 (2.40-2) ...
</system_output>
<system_output timestamp="1584.550099">Selecting previously unselected package libctf0:i386.
</system_output>

### TARGET LINE (Extract and Classify THIS Timestamp):
<system_output timestamp="1584.552582">Preparing to unpack .../013-libctf0_2.40-2_i386.deb ...
</system_output>

Answer: 1584.552582, old event