that's

• das (AAVE)
• dat's (AAVE)
• thass (eye dialect or representing slurred, drunken speech)

• IPA^(key): /ðæts/

• Audio (US)

  (file)

that’s

1. That is.

   That’s the book I've been looking for.

2. That has.

   I’ve managed to find the solution to the problem that's been bugging me all day.

3. That was.
4. That does.

that’s

1. (rare, nonstandard) whose, of which
   • 2009, Doug Whitman, quoted in Neal Whitman, “We Don’t Speak the Same Language” (blog post, 2011 March 23):

     […] the only one that’s title has been released […]

   • 2018, Jimmy Im, “I shopped at Amazon’s new 4-star-product store in New York City — here’s why I wouldn’t do it again”, CBNC.com, 2018 September 28:

     It had products like a WiFi light bulb that’s brightness and even color can be controlled via Smartphone.

• taths