Interval

Represents a time interval, encoded as a Timestamp start (inclusive) and a Timestamp end (exclusive).

The start must be less than or equal to the end. When the start equals the end, the interval is empty (matches no time). When both start and end are unspecified, the interval matches any time.

JSON representation 
{
  "start_time": string,
  "end_time": string
}
Fields
start_time

string (Timestamp format)

Optional. Inclusive start of the interval.

If specified, a Timestamp matching this interval will have to be the same or after the start.

A timestamp in RFC3339 UTC "Zulu" format, with nanosecond resolution and up to nine fractional digits. Examples: "2014-10-02T15:01:23Z" and "2014-10-02T15:01:23.045123456Z".
end_time

string (Timestamp format)

Optional. Exclusive end of the interval.

If specified, a Timestamp matching this interval will have to be before the end.

A timestamp in RFC3339 UTC "Zulu" format, with nanosecond resolution and up to nine fractional digits. Examples: "2014-10-02T15:01:23Z" and "2014-10-02T15:01:23.045123456Z".