Mean Julian Days (MJD) are the agreed standard for something like that. Abolishing local time has a number of issues as linked in other comments. The time stand

Mean Julian Days (MJD) are the agreed standard for something like that. Abolishing local time has a number of issues as linked in other comments. The time standards we currently have are all well suited to their purpose, it's just a case of picking the most appropriate one for the task. (Plenty of room for more TAI in modern technology).