What is the timezone of marketo reports. Is it same as marketo user timezone? Or it is ET timezone?
If you are talking about report subscriptions, they run at night. I normally receive them around 3 - 4 am ET.
I am asking about the email sent date in the report.
Is you are looking at the Email Performance report, it should tell you what time zone it is using. If it shows EST, then, that is what it is using. You can check quickly by finding someone who was sent the email and compare the time of the activity log with what you see in the report.