By the end of this year; during this year (used to indicate something will happen or be completed before the year ends).
今年中に資格を取りたいと考えています。
I want to obtain the qualification within this year.
会社は今年中に新商品を発売する予定だ。
The company plans to launch a new product before the end of this year.
今年中に一度は家族と旅行に行きたい。
I want to go on a trip with my family at least once this year.