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  1. set nowtime [clock seconds]
  2. set happened "Fri, 06 Apr 2012 14:33:00 -0400"
  3. set newtime [clock scan $happened]
  4. puts "Last checked [expr {($nowtime-$newtime)/60}] seconds ago"
Success #stdin #stdout 0.05s 6040KB
stdin
1
2
10
42
11
stdout
Last checked 950 seconds ago