2021-07-29 05:44:12 -07:00
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#!/usr/bin/env sh
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2021-07-29 00:37:35 -07:00
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# YES_ZSH
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2021-07-29 05:44:12 -07:00
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# YES_BASH
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# YES_DASH
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2021-09-23 06:48:05 -07:00
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# YES_ASH
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2021-07-29 00:37:35 -07:00
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2021-07-30 17:57:08 -07:00
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days() { ### @-
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2021-07-31 16:15:27 -07:00
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### compute the number of days since a given date.
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2021-07-30 17:57:08 -07:00
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###
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### ```
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### $ days 'January 1 1970'
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### 18838
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### ```
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2021-07-29 00:37:35 -07:00
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[ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
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echo $(( ($(date +%s) - $(date -d "$1" +%s)) / 60 / 60 / 24 ))
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}
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2021-08-02 13:48:46 -07:00
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[ -n "${preload+-}" ] || days "$@"
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