i did send email to halo
and this is their reply
Thank you for contacting us!
The e-liquid is definitely safe to use after the Best Buy date, as the liquid never really goes bad. The potency and flavor may decrease the farther past that date but there's certainly no harm in using it!
Please let me know if you have any questions or anything else I may assist you with.
Thanks again and have a great day!
Halo Customer Service