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我決定了, 給自己一個期限直到今年完結為止"
I have made up my mind, to bind myself a deadline which is before the end of this year.
決定了..給自己一個尚餘半年時間的期限"
Decision made...to bind myself a deadline which is still an half year to go.

Has decided. Still -odd half year time deadline "or" I had decided.
for oneself, a deadline terminates for oneself until this year.

".. The decision to own the remaining six months of a period of time" or
"I have decided, for himself a deadline until the end of this year"

"has decided. Still -odd half year time deadline "or" I had decided
for oneself, a deadline terminates for oneself until this year "