### CONTEXT (Previous Events):
<system_output timestamp="643.659563">Reading extended state information...
</system_output>
<system_output timestamp="643.681889">Initializing package states...
</system_output>
<system_output timestamp="644.248214">Writing extended state information...
</system_output>
<system_output timestamp="644.49608">Building tag database...
</system_output>
<system_output timestamp="645.035661">The following NEW packages will be installed:
  dpkg{a} gcc-12-base{a} libacl1{a} libbz2-1.0{a} libc6{a} libcom-err2{a} libcrypt1{a} libdb5.3{a} libexpat1{a} libffi8{a} libgcc-s1{a} libgssapi-krb5-2{a} libk5crypto3{a} libkeyutils1{a} libkrb5-3{a} libkrb5support0{a} liblzma5{a} libmd0{a} libncursesw6{a} libnsl2{a} libpcre2-8-0{a} libpython3-stdlib{a} libpython3.11-minimal{a} libpython3.11-stdlib{a} libreadline8{a} libselinux1{a} libsqlite3-0{a} libssl3{a} libtinfo6{a} libtirpc-common{a} libtirpc3{a} libuuid1{a} libzstd1{a} media-types{a} python3{a} python3-minimal{a} python3-waitress python3.11{a} python3.11-minimal{a} readline-common{a} tar{a} zlib1g{a} 
The following packages are RECOMMENDED but will NOT be installed:
  ca-certificates krb5-locales libgpm2 libidn2-0 uuid-runtime 
0 packages upgraded, 42 newly installed, 0 to remove and 0 not upgraded.
Need to get 48.9 kB/17.1 MB of archives. After unpacking 61.7 MB will be used.
Writing extended state information...
</system_output>
<system_output timestamp="645.103579">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="645.105096">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="645.160623">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="645.208191">... [TRUNCATED TO SAVE SPACE] ...</system_output>
<system_output timestamp="645.471153">Building dependency tree...
</system_output>
<system_output timestamp="645.47476">Reading state information...
</system_output>
<system_output timestamp="645.679899">Reading extended state information...
</system_output>
<system_output timestamp="645.701099">Initializing package states...
</system_output>
<system_output timestamp="646.166187">Writing extended state information...
</system_output>

### TARGET LINE (Extract and Classify THIS Timestamp):
<system_output timestamp="646.417377">Building tag database...
</system_output>

Answer: 646.417377, old event