Hi,  Are you referring to your actual system's warranty plan? You can check this on the following link. 
One message popped up when I opened Support Assist and said in 3 days. Then, another message within Support Assist said in 4 days. Then, the website said 5/7 after detecting my PC.  Then, I called Dell tech support, gave them my Service Tag number, and they said 5/8 (it will work on 5/7).  Then I called tech support again and gave them my Express Service number and they said that it will not work on 5/7.  I called back a third time, gave them my Express Service number, and was told 1pm EDT 5/8.  Then I emailed tech support and got a reply saying 5/7 10:59:59pm EDT.  I want to know exactly what day and at what time of day (EDT) it will expire, but getting a straight answer is too difficult.  I'm about to do a factory reset on my Windows 10 64 Alienware 15 R4 computer because Dell tech support couldn't fix their Alienware Command Center (blamed it on Windows), and I want to make sure I finish well before the warranty expires so I can show them that it's not Windows (in case their command center is still broken).  I'm definitely not going to renew my warranty if they can't fix it. 
15 R4, when does my Support Assist warranty expire?