Player Login time help

Okay, so i'm doing a plugin request, and i need to find out the TOTAL time that the player has played on the server for. I have a onPlayerLogin and onPlayerQuit/onPlayerKick, but i need it so it logs the hour and minute they login, and the hour and minute they logout and then it would calculate their time and add it to previous times so it makes a total time that i could compare configurable string value's to, so it does more code

Any ideas? Or if a dev could help, even better

EDIT: if i have to use BML, which may be easier, can someone teamviewer me to help?

 

value1 = time when they login
value2 = time when they logout/leave/kicked
value3 = amount they played this time
currentvalue = the time they have played total

value1 = System.getTimeCurrentMillis()
value2= System.getTimeCurrentMillis()
value1 - value2 = value3
currentvalue = currentvalue + value3

then write it to a config or a database

 

thank you!