My friends and I use the day number as part of our server rules, so we want to keep the day from changing while we're offline, but the only way I know of to do that is to stop the server from running…
Minecraft – ny way to keep the minecraft server from going through the day/night cycle when no one’s online
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On Service Pack 3, there seems to be a lot of problems you apparently can't get around.
Quoting this topic: http://www.minecraftforum.net/viewtopic.php?f=1013&t=22790#p412298
[INFO] Player1 lost connection: End of stream
Researching
Problem:
You're running Windows XP Service Pack 3.
Solution:
Run Minecraft on a Virtual Machine on your computer,
or use one with a different OS. Sorry!
Using command blocks and some redstone, this can be achieved.
First of all, you need to set /gamerule doDaylightCycle to false, to stop the natural daylight cycle. From here, we are going to use command blocks (/give <username> command_block), some redstone, and the command /time add <number> to control the daylight cycle.
Here is a very simple, and pretty easy to tune setup:
The command on the command block is /time add <number>, tuned however you would like (1 item in the clock with an increment of 5 results in a 28 minute day). There is no hidden redstone, and both pistons are sticky. The hoppers feed into each other, and you choose the number of items put in (more items means slower day/night cycle).
The formula for calculating the length of daytime is 140 * (items / number) minutes of daytime (double that for the length of a whole day).
You're also going to want to use the command /gamerule commandBlockOutput false if you don't want periodic chat updates saying Added 1 to time.
You're also going to want to put this in your spawn chunk if you intend for it to work no matter where you are in the world (determine your spawn chunk by breaking your bed and killing yourself).
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Best Answer
You should be able to use command blocks to automatically detect whether players are online or not, then appropriately set the
doDaylightCyclerule appropriately. Try placing the following setup in the server spawn chunks:(Piston is a sticky one.)
The general idea is that the left command checks for online players a few times every second and the comparator next to it will only output a signal if there is at least one player online. Once everyone logs off, the piston retracts and turns off the day/night cycle. As soon as someone logs in again, the comparator will turn on again and toggle the day/night cycle back on.