Let me stick some spaces in some helpful places:
2019 03 28 . 23 00
20190328 means 28th March 2019, and 2300 is in 24-hour clock format, IE 11:00PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how they work.
Events on this stardate
Are you planning on standing for election onto our committee for next year? Then you need to attend tonight's event where you'll be thrown into a pit and engage in a Hunger Games style fight to the death with your peers for the various positions.
This doesn't actually start at 7pm - it will take place after the hustings which could take 5 minutes or 3 hours depending on how many candidates are willing to put themselves forward at this time.