如何在给定日期之间选择json对象

下面是api的json响应。需要使用jq（在shell脚本中）从json获取汇率。 以下是条件： 对于给定的currencyfrom和currencyto，开始日期应等于或大于当前日期，结束日期应等于或小于当前日期

[
    {
        "status": "ACTIVE",
        "startdate": "2019-01-31T00:00:00.000Z",
        "enddate": "2019-02-07T00:00:00.000Z",
        "source": "default",
        "exchangerate": "12",
        "currencyfrom": "AUD",
        "currencyto": "BRL",
        "id": "64ce2916-af8a-42b9-9fb9-def47f824ea2"
    },
    {
        "status": "ACTIVE",
        "startdate": "2019-03-10T00:00:00.000Z",
        "enddate": "2019-03-30T00:00:00.000Z",
        "source": "default",
        "exchangerate": "13",
        "currencyfrom": "BRL",
        "currencyto": "GBP",
        "id": "4fd0dc10-d6b7-4298-924d-281a0d49c2e9"
    },
    {
        "status": "ACTIVE",
        "startdate": "2019-03-10T00:00:00.000Z",
        "enddate": "2019-03-10T16:20:10.813Z",
        "source": "default",
        "exchangerate": "17",
        "currencyfrom": "AUD",
        "currencyto": "BRL",
        "id": "52bfe481-f4cf-4822-9566-886c4faeaf10"
    }
]

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忽略时区注意事项，可以使用以下帮助器函数作为时间比较的基本构造块：

def secs: sub("\\....(?<z>.)$"; .z) | fromdate;

def secs:sub（\\....（.$）；.z）fromdate；

使用它，您可以选择数组中的JSON对象，同时保留数组结构，如下所示：

now as $now
| map(select(.startdate|secs) <= $now and $now <= (.enddate|secs)) )

现在作为$now
|地图（选择（.startdate |秒）