To improve Calculate Number of Days Command

Question

Would like to generate report, which calculate the number of days, the material is in the warehouse. The number of days is the difference between date ($3 field) t

Answer 1

Since you are on cygwin you are using GNU awk which has it's own built-in time functions and so you do not need to be trying to use the shell date command. Just tweak this old command I had lying around to suit your input and output format:

function cvttime(t,     a) {
        split(t,a,"[/:]")
        match("JanFebMarAprMayJunJulAugSepOctNovDec",a[2])
        a[2] = sprintf("%02d",(RSTART+2)/3)
        return( mktime(a[3]" "a[2]" "a[1]" "a[4]" "a[5]" "a[6]) )
}
BEGIN{
t1="01/Dec/2005:00:04:42"
t2="01/Dec/2005:17:14:12"
print cvttime(t2) - cvttime(t1)
}

It uses GNU awk for time functions, see http://www.gnu.org/software/gawk/manual/gawk.html#Time-Functions