如何计算时差

Question

我认为最好从目标开始：

NSYE opens at 09:30:00  - It opens in X minutes/It closes in Y minutes.
LSE opens at 08:00:00 GMT - It opens in X minutes/It closes in Y minutes.

当前代码：

type StockExchanges map[string]string

func showOpeningTime() {
    for stockExchanges, stockExchange := range map[string]StockExchanges{
        "NYSE": {
            "open": "09:30:00",
            "close": "16:00:00",
            "location": "America/New_York",
        },
        "LSE": {
            "open": "08:00:00",
            "close": "16:00:00",
            "location": "Europe/London",
        },
    } {
        currentTime, err := TimeIn(time.Now(), stockExchange)
        if err == nil {
          ///////CODE HERE//////
        } else {
            fmt.Println(stockExchange, "<time unknown>")
        }
    }
    return
}

func TimeIn(t time.Time, stockExchanges StockExchanges) (time.Time, error) {
    loc, err := time.LoadLocation(stockExchanges["location"])
    if err == nil {
        t = t.In(loc)
    }
    return t, err
}

所以对于用户 currentTime 在他们的时区，我想看看所有证券交易所开市前还有多长时间。

例如：假设您处于格林威治标准时间，纽约证券交易所直到 14:30:00 GMT 才开市，所以假设当前时间是 14:29:00 gmt，我希望输出为：

NSYE opens at 09:30:00  - It opens in 00:01:00 minutes.
LSE opens at 08:00:00 GMT - It is currently open.

我正确地得到了用户时区，它 returns 一个包含偏移量的时间对象。我的解决方案可以彻底改变。

Answer 1

您可以转换为today/tomo日期并与当前时间进行比较

package main

import (
    "fmt"
    "strconv"
    "strings"
    "time"
)

type StockExchanges map[string]string

func showOpeningTime() {
    for stockExchanges, stockExchange := range map[string]StockExchanges{
        "NYSE": {
            "open": "09:30:00",
            "close": "16:00:00",
            "location": "America/New_York",
        },
        "LSE": {
            "open": "08:00:00",
            "close": "16:00:00",
            "location": "Europe/London",
        },
    } {
        currentTime, err := TimeIn(time.Now(), stockExchange)
        if err == nil {
            ///////CODE HERE//////
            hour, min, sec := getTime(stockExchange["open"])
            TodaysStartTime := time.Date( currentTime.Year() ,currentTime.Month(),currentTime.Day() ,
                hour,min,sec,0,currentTime.Location())
            hour, min, sec = getTime(stockExchange["close"])
            TodaysEndTime := time.Date( currentTime.Year() ,currentTime.Month(),currentTime.Day() ,
                hour,min,sec,0,currentTime.Location())
            if currentTime.Before(TodaysStartTime) {
                // NSYE opens at 09:30:00  - It opens in 00:01:00 minutes.
                fmt.Println(stockExchanges + " opens at  ",stockExchange["open"] ," - It opens in  ", TodaysStartTime.Sub(currentTime).String()   )
            }else if currentTime.Before(TodaysEndTime)  {
                //opens at 08:00:00 GMT - It is currently open.
                fmt.Println(stockExchanges + " opens at  ",stockExchange["open"] , " It is currently open" )
            }else {
                  // opens tomo
                hour, min, sec = getTime(stockExchange["open"])
                tomo := currentTime.Add(24 * time.Hour)
                TomoStartTime := time.Date( tomo.Year() ,tomo.Month(),tomo.Day() ,
                    hour,min,sec,0,currentTime.Location())
                // NSYE opens at 09:30:00  - It opens in 00:01:00 minutes.
                fmt.Println(stockExchanges + " opens at  ",stockExchange["open"] ," - It opens in  ", TomoStartTime.Sub(currentTime).String()   )
            }
        } else {
            fmt.Println(stockExchange, "<time unknown>")
        }
    }
    return
}

func TimeIn(t time.Time, stockExchanges StockExchanges) (time.Time, error) {
    loc, err := time.LoadLocation(stockExchanges["location"])
    if err == nil {
        t = t.In(loc)
    }
    return t, err
}

func getTime(time string) (int,int,int){
    t:= strings.Split(time,":")
    hour ,_ := strconv.ParseInt(t[0],10,64)
    min ,_ := strconv.ParseInt(t[1],10,64)
    sec ,_ := strconv.ParseInt(t[2],10,64)
    return int(hour),int(min),int(sec)
}


func main () {

    showOpeningTime()
}

签入 go playground

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