The following tables show operand types and results of arithmetical and logical operations.
When evaluating any expressions, there holds that if any operand in a calculation is invalid, the result is also invalid. However, an eval tag is exception, if the parameter "Replace Invalid values with 0" is set. Then it is evaluated as it is mentioned here.
See also the topic Order of operators by the priority
Operator  Operation  Description  Operand types  Result type  

+  addition  Difference between two absolute times is calculated this
way: ATime  BTime = %SubTimeLocal(ATime, BTime) All others combination of absolute and relative times with operators + and  are calculated this way: ATime + RTime = %AddTimeLocal(ATime, RTime) or ATime  RTime = %AddTimeLocal(ATime, RTime) 
integer real boolean time interval 
integer real boolean time interval 


absolute time  
  subtraction  Difference between two absolute times is calculated this way: ATime  BTime = %SubTimeLocal(ATime, BTime) All others combination of absolute and relative times with operators + and  are calculated this way: ATime + RTime = %AddTimeLocal(ATime, RTime) or ATime  RTime = %AddTimeLocal(ATime, RTime) 
integer real boolean time interval 
integer real boolean time interval 


absolute time  
*  multiplication  integer real boolean 
integer real integer 

/  division  integer real boolean 
real real integer 

  unary operator  integer real 
integer real 
In mathematical operations, operands of Boolean type are converted to Integer type as follows:
Note
operator  operation  operand types  result type 

&  logical multiplication  boolean integer 
boolean integer 
  logical addition  boolean  boolean 
!  negation  boolean  boolean 
Logical multiplication of two operands of INTEGER type represents decade form of logical multiplication performed between the corresponding bits of the both operands binary forms.
Example
179 & 217 = 145
1  0  1  1  0  0  1  1  179  
1  1  0  1  1  0  0  1  217  
1  0  0  1  0  0  0  1  145 
operator  operation  operand types  result type 

=  equal  integer real absolute time time interval 
boolean 
#  unequal  integer real absolute time time interval 
boolean 
>  greater  integer real absolute time time interval 
boolean 
<  less than  integer real absolute time time interval 
boolean 
>=  greater or equal  integer real absolute time time interval 
boolean 
<=  less or equal  integer real absolute time time interval 
boolean 