45 lines
1 KiB
Go
45 lines
1 KiB
Go
package util
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import (
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"fmt"
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"slices"
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"time"
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)
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// GetNextOccurrence returns the next occurrence of the given time on the specified weekdays.
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func GetNextOccurrence(weekdays []int, timeStr string, tz string) (time.Time, error) {
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loc, err := time.LoadLocation(tz)
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if err != nil {
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return time.Time{}, fmt.Errorf("invalid timezone: %w", err)
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}
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parsedTime, err := time.Parse("15:04", timeStr)
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if err != nil {
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return time.Time{}, fmt.Errorf("invalid time format, expected HH:MM: %w", err)
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}
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hour, minute := parsedTime.Hour(), parsedTime.Minute()
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now := time.Now().In(loc)
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target := time.Date(
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now.Year(), now.Month(), now.Day(),
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hour, minute, 0, 0, loc,
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)
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// If the target time has passed today, start from tomorrow
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if target.Before(now) {
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target = target.AddDate(0, 0, 1)
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}
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// Check the next 7 days for a valid match
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for range 7 {
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weekday := int(target.Weekday())
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if slices.Contains(weekdays, weekday) {
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return target, nil
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}
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target = target.AddDate(0, 0, 1)
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}
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return time.Time{}, fmt.Errorf("no valid weekday found")
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}
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