I'm not going to be at work today. (если речь о работе)

I'm not coming to work today. (о работе)

I won't be there today. (если о другом месте)

- I'm not coming to work today. / Меня сегодня не будет.

- Why? What happened? / Почему? Что случилось?

I don't have cash today.

I'm short on cash today.

What cafe are we going to today?

Where are we going today? (из контекста обычно понятно, что речь идет о кафе)

What did you do today?

- What did you do today? / Чем вы сегодня занимались?

- The usual. I worked until eight o'clock, then went home and crashed. / Как обычно. Работал до восьми, потом пошел домой и упал спать.

It's the weekend.

It's cloudy today.

enough for one day

Alright, Cal. That's enough MTV for one day. You need to watch something that stimulates your brain. / В общем, Кэл, на сегодня достаточно МТВ. Тебе надо смотреть то, что стимулирует мозг.

Don't go to school today.

The wind is stronger today than it was yesterday.

I'm going over to his house for dinner tonight.