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package lib
import (
"fmt"
"strings"
"time"
)
const dateFmt = "2006-01-02"
// ParseDateRange parses a date range into a start and end date. Dates are
// expected to be in the YYYY-MM-DD format.
//
// Start and end dates are connected by the range operator ".." where end date
// is not included in the date range.
//
// ParseDateRange can also parse open-ended ranges, i.e. start.. or ..end are
// allowed.
func ParseDateRange(s string) (start, end time.Time, err error) {
s = strings.ReplaceAll(s, " ", "")
i := strings.Index(s, "..")
switch {
case i < 0:
// single date
start, err = time.Parse(dateFmt, s)
if err != nil {
err = fmt.Errorf("failed to parse date: %w", err)
return
}
end = start.AddDate(0, 0, 1)
case i == 0:
// end date only
if len(s) < 2 {
err = fmt.Errorf("no date found")
return
}
end, err = time.Parse(dateFmt, s[2:])
if err != nil {
err = fmt.Errorf("failed to parse date: %w", err)
return
}
case i > 0:
// start date first
start, err = time.Parse(dateFmt, s[:i])
if err != nil {
err = fmt.Errorf("failed to parse date: %w", err)
return
}
if len(s[i:]) <= 2 {
return
}
// and end dates if available
end, err = time.Parse(dateFmt, s[(i+2):])
if err != nil {
err = fmt.Errorf("failed to parse date: %w", err)
return
}
}
return
}
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