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Today is 토요일.  토요일 is today.
Yesterday was 금요일.  금요일 was yesterday.
Tomorrow is 일요일.  일요일 is tomorrow.

This month is 8월.  8월 is this month.
Last month was 7월.  7월 was last month.
Next month is 9월.  9월 is next month.

This year is 2025.  2025 is this year.
Last year was 2024.  2024 was last year.
Next year is 2026.  2026 is next year.

This decade is the 스무 년대.  The 스무 년대 is this decade.
Last decade was the 틴즈.  The 틴즈 was last decade.
Next decade is the 서른 년대.  The 서른 년대 is next decade.

This century is the 21st.  The 21st is this century.
Last century was the 20th.  The 20th was last century.
Next century is the 22nd.  The 22nd is next century.

Now are you clear about when what is?