'Today' in the Bible

But if God so clothes the grass of the field, which is alive today and tomorrow is thrown into the furnace, will He not much more clothe you? You of little faith!

And in the morning, ‘There will be a storm today, for the sky is red and threatening.’ Do you know how to discern the appearance of the sky, but cannot discern the signs of the times?

“But what do you think? A man had two sons, and he came to the first and said, ‘Son, go work today in the vineyard.’