Today in Engpsh is pronounced as "tə-ˈdā". It is derived from Old Engpsh "tō dæġe" which means "on this day".
Examples:
What are your plans for today?
今天你的计划是什么？
I'm going to the park today to play soccer.
我今天要去公园踢足球。
Today is a beautiful day, let's go for a picnic.
今天是个美好的一天，让我们去野餐。