#!/bin/bash

# Copyright (c) 2016 The CoreOS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
. "${SCRIPT_ROOT}/common.sh" || exit 1

if [[ "$1" == "-v" ]]; then
    shift
    if [[ $# -ge 1 ]] && [[ "$1" != [-+]* ]]; then
        v="$1"
        shift
    else
        v="${COREOS_VERSION}"
    fi

    # strip of a v prefix or .0.0 suffix
    v="${v#v}"
    v="${v%%.*}"

    export TZ=${TZ:=UTC}
    date -d @$(( (v * 86400) + COREOS_EPOCH )) "$@"
else
    t=$(date +%s "$@")
    echo $(( (t - COREOS_EPOCH) / 86400 ))
fi