How do I find time stamps of date shared to people!!!

I have a time card that is supposed to be sent no later then the 10th of the month @4pm

i tried sharing it and it says I shared it but doesn't tell me a time or date. I sent it on the 9th and they never got it. Now in order for me to not be laid off I must prove how and when I shared it to their email. Is there any way to prove this? Help..