Revelation talks about a 360 day year.  It also talks about stars falling from the skies and the sun being darkened and the moon being darkened and.......well......it sounds like the whole universe will be shaken from these events.  So much so that perhaps one of the signs of the end times may be that the earth's orbit will shift to a 360 day year at some point in the future.  HOWEVER, it is not 360 days today, and it was not 360 days between the edict to rebuild Jerusalem and Yeshua's death.  And until it actually becomes 360 days, we should be using 365.25 days when calculating year spans.  If a year was 365.25 days between the edict and Yeshua's death, then we should use 365.25 year days in making that calculation.
 
Of course, there is one purpose for which it would be great to use a 360 day year.  I could apply for social security when I hit 64 instead of waiting for age 65.  :-)
 
Shalom, Joe