You: It's the lunar seventh month and I don't feel comfortable working till late, you see...
Boss: It's the lunar seventh month!? No wonder I feel chilly tonight. Let's go home together.
In the real world....
You: Boss, can I don't work OT tonight?
Boss: Why?
You: It's the lunar seventh month and I don't feel comfortable working till late, you see...
Boss: Seventh month, Eighth month, Ninth month, IT DOESN'T MATTER WHAT MONTH IT IS! If you don't work OT tonight, the only time you will be working come next year is during the lunar seventh month! Now go back and work.