Absolutely possible...
You can do it quickly using theses queries. But watch for exceptions in your text.
For underligning date:
\u\l+,\h\u\l+\h\d\d?\l\l
For bolding hours and peoples/hours
(\d+\hpeoples?\h/\h)?\d+\hhours?
For bolding minutes
\d+\hminutes
