123 lines
2.4 KiB
Go
123 lines
2.4 KiB
Go
package txt
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import (
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"strings"
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"time"
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)
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// DateFromFilePath returns a string as time or the zero time instant in case it can not be converted.
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func DateFromFilePath(s string) (result time.Time) {
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defer func() {
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if r := recover(); r != nil {
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result = time.Time{}
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}
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}()
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if len(s) < 6 {
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return time.Time{}
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}
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if !strings.HasPrefix(s, "/") {
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s = "/" + s
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}
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b := []byte(s)
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if found := DateTimeRegexp.Find(b); len(found) > 0 { // Is it a date with time like "2020-01-30_09-57-18"?
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n := DateIntRegexp.FindAll(found, -1)
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if len(n) < 6 {
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return result
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}
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year := ExpandYear(string(n[0]))
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month := Int(string(n[1]))
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day := Int(string(n[2]))
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hour := Int(string(n[3]))
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min := Int(string(n[4]))
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sec := Int(string(n[5]))
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// Perform date plausibility check.
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if year < YearMin || year > YearMax || month < MonthMin || month > MonthMax || day < DayMin || day > DayMax {
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return result
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}
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// Perform time plausibility check.
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if hour < HourMin || hour > HourMax || min < MinMin || min > MinMax || sec < SecMin || sec > SecMax {
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return result
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}
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result = time.Date(
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year,
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time.Month(month),
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day,
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hour,
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min,
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sec,
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0,
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time.UTC)
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} else if found = DateRegexp.Find(b); len(found) > 0 { // Is it a date only like "2020-01-30"?
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n := DateIntRegexp.FindAll(found, -1)
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if len(n) != 3 {
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return result
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}
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year := ExpandYear(string(n[0]))
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month := Int(string(n[1]))
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day := Int(string(n[2]))
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// Perform date plausibility check.
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if year < YearMin || year > YearMax || month < MonthMin || month > MonthMax || day < DayMin || day > DayMax {
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return result
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}
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result = time.Date(
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year,
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time.Month(month),
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day,
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0,
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0,
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0,
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0,
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time.UTC)
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} else if found = DatePathRegexp.Find(b); len(found) > 0 { // Is it a date path like "2020/01/03"?
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n := DateIntRegexp.FindAll(found, -1)
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if len(n) < 2 || len(n) > 3 {
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return result
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}
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year := ExpandYear(string(n[0]))
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month := Int(string(n[1]))
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if year < YearMin || year > YearMax || month < MonthMin || month > MonthMax {
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return result
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}
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if len(n) == 2 {
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result = time.Date(
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year,
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time.Month(month),
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1,
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0,
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0,
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0,
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0,
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time.UTC)
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} else if day := Int(string(n[2])); day >= DayMin && day <= DayMax {
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result = time.Date(
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year,
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time.Month(month),
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day,
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0,
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0,
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0,
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0,
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time.UTC)
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}
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}
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return result.UTC()
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}
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