Computer not updating daylight savings time
Since computers rely on clocks to execute instructions and perform functions, failure to account for local time changes can lead to unintended consequences.
DST is now in effect for 238 days, or about 65% of the year, although Congress retained the right to revert to the prior law should the change prove unpopular or if energy savings are not significant.
The only way to find out is to wait and see, or to contact the manufacturer of the clock.
There are a large number of non-radio controlled clocks, marketed under names like "AUTOSET" or "SMARTSET" that have internal firmware that automatically changes the time by one hour on the transition days to and from DST.
All NIST time services broadcast Coordinated Universal Time (UTC).
Corrections for your local time zone and for daylight saving time are provided by your computer's operating system.