Add helpers to parse time strings using multiple formats at once

Signed-off-by: Knut Ahlers <knut@ahlers.me>

time/parse.go

@@ -0,0 +1,36 @@
+package time
+
+import (
+	"errors"
+	gotime "time"
+)
+
+// ErrParseNotPossible describes a collected error which is returned
+// when the given date value could not be parsed with any given layout
+var ErrParseNotPossible = errors.New("No layout matched given value or other error occurred")
+
+// MultiParse takes multiple layout strings and tries to parse the
+// value with them. In case none of the layouts matches or another error
+// occurs ErrParseNotPossible is returned
+func MultiParse(layouts []string, value string) (gotime.Time, error) {
+	for _, layout := range layouts {
+		if t, err := gotime.Parse(layout, value); err == nil {
+			return t, nil
+		}
+	}
+
+	return gotime.Time{}, ErrParseNotPossible
+}
+
+// MultiParseInLocation takes multiple layouts and tries to parse the
+// value with them using time.ParseInLocation. In case none of the layouts
+// matches or another error occurs ErrParseNotPossible is returned
+func MultiParseInLocation(layouts []string, value string, loc *gotime.Location) (gotime.Time, error) {
+	for _, layout := range layouts {
+		if t, err := gotime.ParseInLocation(layout, value, loc); err == nil {
+			return t, nil
+		}
+	}
+
+	return gotime.Time{}, ErrParseNotPossible
+}