Mysql slow query log always include "# Time:"
A lot of things have changed in the slowlog over the versions.  Discover the inconsistencies and code to them!

# Time (and maybe some other things) are specified only when they change.

In 5.7.2 Time will include microseconds.  This is one of many syntax changes that have happened over the years -- be careful.  Percona and MariaDB also have different things that can show in the SlowLog.

Query time used to be just an integer.