If your machine has only Arch Linux installed on it (not a dual boot machine with Windows), you should choose in /etc/rc.conf :
I'm not sure of the time zone for New Mexico, so check that and choose the right one for your place.
After a reboot, you have to set the RTC (Real Time Clock), also called Hardware clock, using these commands under root :
/sbin/hwclock --utc --set --date=newdate
see 'man hwclock' for details on this command
Take care to give the UTC time in '--date=newdate', not the local time.
Normally that should take care of DST time changing.
But I also read that a new date for DST time changing has been chosen this year in USA, you should look for infos about that to find other specific actions that has to be done.
I think there are many threads about that in the forum.
See also the Arch Linux Forum