37 lines
810 B
Go
37 lines
810 B
Go
package gtime
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import (
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"fmt"
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"regexp"
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"strconv"
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"time"
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)
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var dateUnitPattern = regexp.MustCompile(`^(\d+)([dwMy])$`)
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// ParseInterval parses an interval with support for all units that Grafana uses.
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func ParseInterval(interval string) (time.Duration, error) {
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result := dateUnitPattern.FindSubmatch([]byte(interval))
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if len(result) != 3 {
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return time.ParseDuration(interval)
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}
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num, _ := strconv.Atoi(string(result[1]))
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period := string(result[2])
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now := time.Now()
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switch period {
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case "d":
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return now.Sub(now.AddDate(0, 0, -num)), nil
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case "w":
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return now.Sub(now.AddDate(0, 0, -num*7)), nil
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case "M":
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return now.Sub(now.AddDate(0, -num, 0)), nil
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case "y":
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return now.Sub(now.AddDate(-num, 0, 0)), nil
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}
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return 0, fmt.Errorf("ParseInterval: invalid duration %q", interval)
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}
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