Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 494)

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IEC Operators and additional norm extending functions
492 DMS 3.2 EN 02/2011 TD29

9.9.7 DATE_TO/DT_TO Conversions
Converting from the variable type DATE or DATE_AND_TIME to a different type:
The date will be stored internally in a DWORD in seconds since Jan. 1, 1970. This value
will then be converted.
When you perform a type conversion from a larger to a smaller type, you risk losing
some information
For STRING type variables, the result is the date constant.
Examples in IL:
LD D#1970-01-01
DATE_TO_BOOL
ST b (* Result is FALSE *)
LD D#1970-01-15
DATE_TO_INT
ST i (* Result is 29952 *)
LD DT#1970-01-15-05:05:05
DT_TO_BYTE
ST byt (* Result is 129 *)
LD DT#1998-02-13-14:20
DT_TO STRING
ST str (* Result is 'DT#1998-02-
13-14:20' *)
Examples in ST:
b :=DATE_TO_BOOL(D#1970-01-01); (* Result is FALSE *)
i :=DATE_TO_INT(D#1970-01-15); (* Result is 29952 *)
byt :=DT_TO_BYTE(DT#1970-01-15-
05:05:05); (* Result is 129 *)
str:=DT_TO_STRING(DT#1998-02-13-
14:20); (* Result is
'DT#1998-02-13-14:20' *)