CODEWITHSUNDEEP
scriptingbatch-filedos
Santa
Santa

Reputation: 11545

DOS batch: Advance system clock N number of days?

I need some pointer crafting an MS-DOS batch "function" to advance the system calendar N number of days from the current one. Is there a more machine-friendly command, or am I stuck with DATE and some Franken-hack parsing of it?

Upvotes: 1

Views: 483

Answers (2)

Frank Bollack
Frank Bollack

Reputation: 25186

On one of my favorite batch sites on the net Rob van der Woude's Scripting Pages you can find in the examples section a script called DateAdd.bat. It will calculate and print a new date based on a given date and offset.

It should be fairly easy to change the script to your needs or use it along with your own script. Get back to us if you need further help with that.

Upvotes: 2

paxdiablo
paxdiablo

Reputation: 881703

If you're truly using MS-DOS rather than the more advanced cmd.exe, your options are very limited since the variable manipulation was pretty bad.

I do remember needing something similar in a previous life. From memory, rather than trying to screw around with date calculations, we simply ran a loop (one iteration for each day) and, inside the loop, set the time to 23:59 then wait for five seconds or so. Unfortunately, I think that pre-dated ping so we couldn't even use the sleep trick - we had to run a lengthy goto loop to be certain.

That way, DOS itself figured out whether "tomorrow" was the 31st of September or 1st of October.

In the end, it became too much trouble so I would suggest you do what we finished up doing. Grab yourself a copy of Turbo C from Borland's (or InPrise or Enchilada or whatever they're called nowadays - they'll always be Borland to me) museum site and write a quick little C program to do it for you .

Upvotes: 0

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