Confused about times on soundings

Ok, so I was looking through soundings on http://62.202.7.134/hpbo/sounding_usa.aspx and noticed they have 0000Z soundings for today. According to my calculations, that hasn't happened yet. What am I missing here? Am I just stupid and miscalculating, or are they going by a different time?

Thanks!

EDIT: I figured it out... I'm dumb. Its a new day going by GMT or Zulu, it just happens to start at 7:00PM CDT the previous day for us.

-Andrew
 
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