set nowtime [clock seconds]
set happened "Fri, 06 Apr 2012 14:33:00 -0400"
set newtime [clock scan $happened]
set checked [expr {($nowtime-$newtime)/60}]
if {$checked>60} {
puts "Last checked [expr {($checked)/60}] hours ago"
}else{
puts "Last checked $checked minutes ago"
}
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