I tend to be picky about what libraries I use in any project so it's best to pick a couple that you know you'll need and make sure to trim the fat where possibl

I tend to be picky about what libraries I use in any project so it's best to pick a couple that you know you'll need and make sure to trim the fat where possible. If a specific date/time library seems far too big for your purposes then see if you can make some functions that fit the bill on your own. Eventually, you'll figure out what's absolutely necessary from trial and error and what's just "nice to have."