By The End Of The Year
Before The End Of This Year, Within The Year
Inside the year means by the end of the year. In other words, before the end of this year, or within the year.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
to do something by the end of the year
to wrap something up by the end of the year
can be done by the end of the year
A calf will be born by the end of the year.
Please leave the apartment by the end of the year.
The goal is to pass JLPT N4 by the end of this year.