@Asif138 wrote:
Dear Friends,
how can i compare system time with set time by user to turn on/off any LED.
Let say i want one LED to turn on every evening at 5pm and turn off every morning at 6am???
Hi, Asif. Can I assume that you are just learning LabVIEW, and maybe are also fairly new to Programming, in general?
The first thing to think about is how do you really want your code to function. Suppose I read the time and it is 5:01 PM. What do you want your code to do? Suppose it is 5:00:00.0001 PM. Note that it may be "highly unlikely" that the time will ever be exactly 5:00 PM.
The next thing to think about is that you are concerned only with a 24-hour clock, not with the date.
Closely related to the first point is how often you want to check the time. I assume you don't want the program to spend 99.9999% of the time checking-and-doing-nothing because it is not "turn-on" or "turn-off" time. If it "wakes up" and checks every 5 minutes, then 99.9999% of the time the computer can be doing other, more useful, things, and you'll turn on and off "close" to the right time.
Take a look at the Seconds to Date/Time function, and read its Help to see how it works. You can use it to give you the Minute (0 to 59) and Hour (0 to 23) when it is called. That, and a little logic (and possibly some arithmetic) should provide a solution for you.
Bob Schor
