Subtracing Date and Time

[kcmoss 0]

I need to subtract a on  date and time stamp variable from another one to show how longs before the 2 date and times are equal so the operator can see how long they have to wait.  Any help would be appreciated.

Ken

[Jay Anthony 118]

Suggest you look at  CALENDAR SUBTRACT: CSUB(731)

[kcmoss 0]

CSUB will only subtract hours minutes and seconds.  Looking for a away to do date as well

[TigerLily 2]

If you can use Structured text this should work:

(*I USED THE SAME TIME STAMP VARIABLES IN THE EQUATIONS BELOW WHICH ARE JUST THE PLC CLOCK ADDRESS IN MY PROGRAM, BUT THE 1 AND 2 LINES SHOULD BE YOUR TWO DIFFERENT TIME STAMP VARIABLE SETS, YOU COULD ALSO INCLUDE THE MONTH AND YEAR IN THE SAME MANNER IF NEEDED*)

UINT_DAY1:=STRING_TO_UINT(LEFT((WORD_TO_STRING(CLOCK_DD_HH)),2));
UINT_DAY2:= STRING_TO_UINT(LEFT((WORD_TO_STRING(CLOCK_DD_HH)),2));
(*SUBTRACT THE TWO VALUES FOR YOUR DAYS REMAINING RESULT*)

UINT_HH1:= STRING_TO_UINT(RIGHT((WORD_TO_STRING(CLOCK_DD_HH)),2));
UINT_HH2:= STRING_TO_UINT(RIGHT((WORD_TO_STRING(CLOCK_DD_HH)),2));
(*SUBTRACT THE TWO VALUES FOR YOUR HOURS REMAINING RESULT*)

UINT_MM1:=STRING_TO_UINT(LEFT((WORD_TO_STRING(CLOCK_MM_SS)),2));
UINT_MM2:= STRING_TO_UINT(LEFT((WORD_TO_STRING(CLOCK_MM_SS)),2));
(*SUBTRACT THE TWO VALUES FOR YOUR MINUTES REMAINING RESULT*)

UINT_SS1:= STRING_TO_UINT(RIGHT((WORD_TO_STRING(CLOCK_MM_SS)),2));
UINT_SS2:= STRING_TO_UINT(RIGHT((WORD_TO_STRING(CLOCK_MM_SS)),2));
(*SUBTRACT THE TWO VALUES FOR YOUR SECONDS REMAINING RESULT*)

I am not sure it is the best or cleanest way to do it, but it will work!

[Jay Anthony 118]

Awesome Tiger Lily! Good to see you around.

[TigerLily 2]

Thank you Jay!  I just had to do the same thing for one of my projects so happy to share!!