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hashrocket A Hashrocket project

Relative Dates with GNU date

GNU date ships with the ability to add and subtract dates. Using the -d flag one can add add or subtract years, months, days, weeks, and seconds. As an example here's a future date helper:

in() {
  if [ "$(uname)" == "Darwin" ]; then
    gdate -d"$(gdate) +$1 $2" "+%Y-%m-%d"
    date -d"$(date) +$1 $2" "+%Y-%m-%d"
~❯ in 7 days
~❯ in 2 months

This can be handy for some CLI utilities like Todo.txt.

For example:

~❯ t add Post first TIL due:$(in 3 days)
10 Post first TIL due:2018-03-20
TODO: 10 added.

Note: If you're on a Mac you'll need to install the GNU coreutils. By default all commands will be prepended with g, hence gdate above.

brew install coreutils

Check the man pages for more info.

See More #command-line TILs