A ROM backup made today indicates tomorrows date. Looks like CWM uses GMT or maybe GMT-1 instead of the system time to stamp the backup file name. Just FYI if your looking for backups you swear you made on a certain date and time.
I'm seeing this on:
DL30
Super Clean 1.0
Both Mac and Phone time settings are accurate. Tried to search prior to posting in case this has been covered already.
CC