I've waited and waited till the number of the replies hits 20.
Now, I have to admit that you have taken the perfect way to teach me that I can't get my way through. Bingo! You win!

I know I won't give up even if you like my way of teachingn or not. And so I'll make my lecture here keep going. Let's get into the classroom again.

Those who answered to my question understood when and where they should say 'This is not my day,' And today I'd like to talk about 'day' more deeply with you.

Today's expressions for you are
'Having a bad hair day. I really hate this.'
'I'll call it a day and go to bed now.'
'Stop doing this to me. As you know, every dog has his day.'
'I feel bloated. It's my fat day.'
'Where is John?' 'He's left. It's poet's day today.'

Why don't you just check if you know what they mean?
Tell me if there is any expression that you don't know. Then I'll let you know.

It's Monday today.
Give it what you think as for a starting day of a week.

Chao
Ernest


P.S. one more that doesn't have any modesty for fun. Army soldiers can understand this.
'Hooray! It's the day the eagle shits.'
Try. Ha, Ha.