Subtracting Days

This topic has 2 replies, 2 voices, and was last updated 17 years, 10 months ago by Randy Colella.

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November 28, 2006 at 6:03 pm #48915

Randy Colella
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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.
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- November 28, 2006 at 6:39 pm #60101
  
  Steve Carter
  Participant
  
  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
- November 28, 2006 at 7:13 pm #60102
  
  Randy Colella
  Participant
  
  Thanks a lot Steve.
  
  Randy Colella
  
  Massachusetts Eye & Ear Infirmary
  
  Boston, MA
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