Yes, but only up to 2 hours before the scheduled shift start time. Anything more than 2 hours must be posted as another shift.
Shift extension requests for more than 2 hours from the scheduled shift start time will not be paid out by ESHYFT.
The facility is not authorized to ask you to come in more than 2 hours before the scheduled shift start time without posting a new shift for you.
When asked to come in early, you may submit a Time Adjustment Form to have your timecard extended up to 2 hours from the scheduled shift start time.
See this article for more details. How to submit a timecard adjustment form