Subtracting Days

[Randy Colella]

How do I take a date (not the current date) and subtract it from another date to see how many days have elapsed.

I cannot use the “20061101 – 20061031” format because in this case it would give me 70 days due to the month change.

Topic

[Steve Carter]

There may be an easier way, but this will work:

set today [clock scan “20061128”]

set lastWeek [clock scan “20061121”]

set elapsedSecs [expr $today – $lastWeek]

set numDays [expr $elapsedSecs / 86400]

Steve

[Randy Colella]

Thanks a lot Steve.

Randy Colella

Massachusetts Eye & Ear Infirmary

Boston, MA

[Author]

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