Dear P’Chang,
Calm down my brother!!
Please understand and sympathize us.
We received PO on 4/6/2015.
If you inform 4 months. It must be 4/10/2015, Right?
But, In PO shown promise delivery date on 15/9/2015.
Also you inform this project to team on 12/6/2015.
Internal meeting on 15/6/2015.
Kick off meeting with customer on 16/6/2015.
Actually, We have working time from 17/6/2015 to 15/9/2015. It’s just 91 days (Include Saturday and Sunday