dongnai6973 2014-11-30 18:09
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在Golang中解析日期和时间的最佳方法

I have a lot of datetime values incoming as string into my golang program. The format is fixed in number of digit:

2006/01/02 15:04:05

I started to parse these dates with the time.Parse function

const dtFormat = "2006/01/02 15:04:05"

func ParseDate1(strdate string) (time.Time, error) {
    return time.Parse(dtFormat, strdate)
}

but I had some performances issue with my program. Thus I tried to tune it by writting my own parsing function, taking into account that my format is kind of fixed:

func ParseDate2(strdate string) (time.Time, error) {
    year, _ := strconv.Atoi(strdate[:4])
    month, _ := strconv.Atoi(strdate[5:7])
    day, _ := strconv.Atoi(strdate[8:10])
    hour, _ := strconv.Atoi(strdate[11:13])
    minute, _ := strconv.Atoi(strdate[14:16])
    second, _ := strconv.Atoi(strdate[17:19])

    return time.Date(year, time.Month(month), day, hour, minute, second, 0, time.UTC), nil
}

finally I did a benchmark on top of these 2 functions and got the following result:

 BenchmarkParseDate1      5000000               343 ns/op
 BenchmarkParseDate2     10000000               248 ns/op

This is a performance improvement by 27%. Is there a better way in terms of performances that could improve such datetime parsing ?

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