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rc/sh/days

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#!/usr/bin/env sh
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# YES_ZSH
# YES_BASH
# YES_DASH
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# YES_ASH
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days() { ### @-
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### compute the number of days since a given date.
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###
### ```
### $ days 'January 1 1970'
### 18838
### ```
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[ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
echo $(( ($(date +%s) - $(date -d "$1" +%s)) / 60 / 60 / 24 ))
}
[ -n "${preload+-}" ] || days "$@"