#!/bin/bash
if [[ "$#" -lt 1 ]]; then
    echo -e "Usage: $0 <date>"
    echo -e ""
    echo -e "\t<date> accepts the same formats as the date -d command"
    echo -e ""
    echo -e "Examples:"
    echo -e "\t$0 -2hour"
    echo -e "\t$0 -3day"
    echo -e "\t$0 -2hour25min"
    echo -e "\t$0 'today 3pm'"
    echo -e "\t$0 'today 3pm'"
    exit
fi

WHEN=$(date -d $1) || exit
shift


GIT_AUTHOR_DATE="$WHEN" GIT_COMMITTER_DATE="$WHEN" git commit --amend --no-edit --date="$WHEN"