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golang-module
Parse method is too strict and not general enough, I hope it can be smarter, such as the following parsing method, which is relatively efficient and general
下面这种方式可以很好地兼容 分隔符 和 0补位 两种日期格式，而不是有了分隔符还需要0补位 ` var dateFieldLens = [9]int{4, 2, 2, 2, 2, 2, 9, 2, 2}
// ParseGeneralDate 解析任意字段有序的日期 // 顺序必须是：年月日时分秒纳秒，兼容ISO8601UTC时区 // 时间字段可以是任意分隔符或填充位数，示例如下： // 2022年8月21日19点18分38秒123456789纳秒 // 20220821191838.123456789 // 2022-8-21T19:18:38.123456789+8:30 // 2022-8-21 19:18:38Z(可以没有纳秒) // 2022-8-21(可以没有时间，甚至可以没有日期) func ParseGeneralDate(input []rune) time.Time { dateFields := [9]int{1, 1, 1} var fieldNum int var fieldLen int var zoneRune rune var nanoTimes = 1000000000
// 提取日期字段
for _, r := range input {
if r <= '9' && r >= '0' {
fieldLen++
if fieldNum == 6 {
nanoTimes /= 10 // 纳秒是小数形式
}
if fieldLen == 1 { // 覆盖字段
dateFields[fieldNum] = int(r - '0')
} else if fieldLen == dateFieldLens[fieldNum] { // 字段已满
dateFields[fieldNum] = dateFields[fieldNum]*10 + int(r-'0')
if fieldNum > 7 {
break
}
fieldNum++
fieldLen = 0
} else { // 追加字段
dateFields[fieldNum] = dateFields[fieldNum]*10 + int(r-'0')
}
} else {
// 当前字段长度大于0则进入下一个字段
if fieldLen > 0 {
if fieldNum > 7 {
break
}
fieldNum++
fieldLen = 0
}
// 处理时区，遵循ISO8601：UTC时区
if fieldNum > 5 {
if r == 'Z' { // 结束遍历
zoneRune = r
break
}
if r == '+' || r == '-' { // 跳转时区字段
zoneRune = r
fieldNum = 7
}
}
}
}
// 计算时区与偏移
timeZone := time.Local
if zoneRune == 'Z' {
timeZone = time.UTC
} else if zoneRune == '+' {
timeZone = time.FixedZone("", dateFields[7]*3600+dateFields[8]*60)
} else if zoneRune == '-' {
timeZone = time.FixedZone("", -dateFields[7]*3600-dateFields[8]*60)
}
return time.Date(dateFields[0], time.Month(dateFields[1]), dateFields[2],
dateFields[3], dateFields[4], dateFields[5], dateFields[6]*nanoTimes, timeZone)
} `
The issue body's language is not English, translate it automatically, please use English next time. 👯👭🏻🧑🤝🧑👫🧑🏿🤝🧑🏻👩🏾🤝👨🏿👬🏿
` var dateFieldLens = [9]int{4, 2, 2, 2, 2, 2, 9, 2, 2}
// ParseGeneralDate parses any field ordered date // The order must be: year, month, day, hour, minute, second, nanosecond, compatible with ISO8601UTC time zone // The time field can be any delimiter or number of padding digits, examples are as follows: // Aug 21, 2022 19:18:38 123456789 ns // 20220821191838.123456789 // 2022-8-21T19:18:38.123456789+8:30 // 2022-8-21 19:18:38Z (can be without nanoseconds) // 2022-8-21 (can have no time or even no date) func ParseGeneralDate(input []rune) time.Time { dateFields := [9]int{1, 1, 1} var fieldNum int var fieldLen int var zoneRune rune var nanoTimes = 1000000000
// extract the date field for _, r := range input { if r <= '9' && r >= '0' { fieldLen++ if fieldNum == 6 { nanoTimes /= 10 // nanoseconds are in decimal form } if fieldLen == 1 { // override field dateFields[fieldNum] = int(r - '0') } else if fieldLen == dateFieldLens[fieldNum] { // field is full dateFields[fieldNum] = dateFields[fieldNum]*10 + int(r-'0') if fieldNum > 7 { break } fieldNum++ fieldLen = 0 } else { // append field dateFields[fieldNum] = dateFields[fieldNum]*10 + int(r-'0') } } else { // If the current field length is greater than 0, enter the next field if fieldLen > 0 { if fieldNum > 7 { break } fieldNum++ fieldLen = 0 }
// handle time zone, follow ISO8601: UTC time zone if fieldNum > 5 { if r == 'Z' { // end traversal zoneRune = r break } if r == '+' || r == '-' { // jump to the time zone field zoneRune = r fieldNum = 7 } } } }
// Calculate time zone and offset timeZone := time.Local if zoneRune == 'Z' { timeZone = time.UTC } else if zoneRune == '+' { timeZone = time.FixedZone("", dateFields[7]*3600+dateFields[8]*60) } else if zoneRune == '-' { timeZone = time.FixedZone("", -dateFields[7]*3600-dateFields[8]*60) }
return time.Date(dateFields[0], time.Month(dateFields[1]), dateFields[2], dateFields[3], dateFields[4], dateFields[5], dateFields[6]*nanoTimes, timeZone) } `
