I say both. You coming over on July 4th for our big Forth of July Celebration? And year/month/day/hour/minute/second is best as its largest to smallest and if

I say both. You coming over on July 4th for our big Forth of July Celebration? And year/month/day/hour/minute/second is best as its largest to smallest and if you name your documents / fields in this format it sorts better.