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