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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
This is a little trickier than finding the last Sunday, because you know the last Sunday is in the first position of the last line. The trick is to use the NF less than or equal to 7 so it picks up all the lines then grep out any empty lines.
Find files in a specific date range - in this case, the first half of last year.
-newermt = modification time of the file is more recent than this date
GNU find allows any date specfication that GNU date would accept, e.g.
find . -type f -newermt "3 years ago" ! -newermt "2 years ago"
find . -type f -newermt "last monday"
Example above will recursively find files in current directory created/modified in 2010.
Only shows files with actual changes to text (excluding whitespace). Useful if you've messed up permissions or transferred in files from windows or something like that, so that you can get a list of changed files, and clean up the rest.
With this command you can get a previous or future date or time. Where can you use this? How about finding all files modified or created in the last 5 mins?
touch -t `echo $(date -d "5 minute ago" "+%G%m%d%H%M.%S")` me && find . -type f -newer me
List all directories created since last week?
touch -t `echo $(date -d "1 week ago" "+%G%m%d%H%M.%S")` me && find . -type d -cnewer me
I'm sure you can think of more ways to use it. Requires coreutils package.
ncal -e shows the date of Easter this year. ncal -e YYYY shows the date of Easter in a given year. ncal -o works the same way, but for Orthodox dates.