Print a date from 3 days ago

TZ=PST8PDT+72 date '+%Y_%m_%d'
This command prints the Date (Not time) from 3 days ago (72 hours ago). This works on systems without GNU date (MacOSX , Solaris, FreeBSD).
Sample Output
$ TZ=PST8PDT+72 date '+%Y_%m_%d'
2010_06_29


4
2010-07-02 00:29:27

What Others Think

why my console display 2010_07_01 in MacOSX10.6.4 OS?
fire9 · 433 weeks and 4 days ago
@fire9 : I'm not sure. It works for me on 10.5.8. Try '+24' instead of '+72'
StefanLasiewski · 433 weeks and 4 days ago
You can also use: date -d "-3 days" +%Y_%m_%d but I dont know if that will work on non gnu systems..
xeor · 433 weeks and 4 days ago
No, that will not work on non-GNU systems and that is exactly why this recipe is so good, so your attempt to help was kind of off the target. Everybody knows the date calculation capacities of GNU date (which don't apply to the regular UNIX date command) and the difficulties of working with dates on AIX/HP-UX/Solaris without perl.
Patola · 433 weeks and 2 days ago
@xeor : On non-GNU systems (MacOSX, *BSD, etc). The '-d' flag "SETS the kernel's value for daylight saving time." It *sets* the time.
StefanLasiewski · 432 weeks and 6 days ago
It worked for by changing PST8PDT to GMT, so the new command: TZ=GMT+72 date '+%Y_%m_%d'
ali980 · 363 weeks and 5 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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