Canadian standard time and frequency station CHU will not have to change the frequency of its 7 MHz signal, which is by far the most frequently used. The station was able to modify the conditions of its licence (Canadian spelling) to continue broadcasting on 7335.0 R3E (upper sideband with a partial carrier). CHU will not leave the air any time in the forseeable future.
Remember that US daylight savings are earlier this year, and all your devices that reset as per the old formula will need manual updating or firmware modifications. This is an expensive pain in the butt, and if I may editorialize for a second, I wish they'd stop screwing around with the time. Pick two dates and stick to them, regardless of who lobbies Congress.
The change is March 11, but many short wave schedules will change on the first.
