Firebird v1.5.3

Does anyone know what's going on here?

DECLARE VARIABLE tsTranCreateDate TimeStamp;
DECLARE VARIABLE tsTest TimeStamp;

Starting Value:
tsTranCreateDate = 10/31/201 7:50:16 AM

Two days:
tsTest = (:tsTranCreateDate - (2.0));
Correctly returns 10/29/201 7:50:16 AM

One hour:
tsTest = (:tsTranCreateDate - (1.0/24.0));
Incorrectly returns 10/31/201 6:52:40 AM

One minute:
tsTest = (:tsTranCreateDate - (1.0/1440.0));
Incorrectly returns 10/31/201 7:50:16 AM

One second:
tsTest = (:tsTranCreateDate - (1.0/86400.0));

Incorrectly returns 10/31/201 7:50:16 AM

Subtract 2 days works fine.  Subtract 1 hour is wrong.  Subtract one minute or 
1 second does nothing

Any ideas?

Mike


  ----- Original Message ----- 
  From: 'Softtech Support' [email protected] [firebird-support] 
  To: Firebird Support 
  Sent: Tuesday, March 10, 2015 2:22 PM
  Subject: [firebird-support] Add 1 minute to a TimeStamp


    

  Greetings All,

  What is the best way in a stored procedure to add a minute or a few seconds 
to a TimeStamp?

  Thanks,

  Mike



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