I REALLY hate to say this, but I kinda get gut feelings sometimes, and  when I saw CWM 5504, I got one of those feelings. I have never tried it  because of that, but I have made numerous backups from all of the Sharp  ROMs, except rev 2.1 cause I haven't had time, and restored them through  CWM 5027. Plus Ver2 is a slightly modified stock Triumph kernel. I have  never had the date/time issue, except when I was flashing nb0's,  because they did not connect to the network to update the date and time.  But after setting the time and date it was correct in the nandroid  backups. 
Edit: I just used TWRP 2.1.3 recovery with a buckup I made 5-29 when I  tested TWRP with the Sharp ROM and date and times are fine, it restored  fine also. I have only had one issue with CWM recovery and the Sharp ROM  and that was a md5 verification, but CWM has done that to me a couple  times in the past with other ROMs.