Google People API - Birthday - Date object is not returned in GET requests - google-people-api

Question

In Google People - people.connections.list and other GET APIs, the Date object of Birthday field is not returned for some Contacts. Have authenticated with the full People scope [https://www.googleapis.com/auth/contacts].
We also do not know the format of the "text" field to parse that, as the param can have any random string.
How to parse the birthday of a user? When will the Date object not be returned?
Sample Request
https://people.googleapis.com/v1/people/me/connections?pageSize=100&requestSyncToken=true&personFields=birthdays
Sample response Birthdays
{
"birthdays": [
{
"metadata": {
"source": {
"id": "3ebd95668aeed9d7",
"type": "CONTACT"
},
"primary": true
},
"text": "2000-07-24"
}
],
"resourceName": "people/c4520933868599957975",
"etag": "<etag>"
},
{
"birthdays": [
{
"metadata": {
"source": {
"id": "5f5712ce0861c5b0",
"type": "CONTACT"
},
"primary": true
},
"text": "1880-03-11"
}
],
"resourceName": "people/c6869980432690169264",
"etag": "<etag>"
},
{
"birthdays": [
{
"date": {
"month": 1,
"year": 1990,
"day": 26
},
"metadata": {
"source": {
"id": "a16dde58e814a36",
"type": "CONTACT"
},
"primary": true
},
"text": "01/26/1990"
}
],
"resourceName": "people/c727012367875000886",
"etag": "<etag>"
},
{
"birthdays": [
{
"date": {
"month": 1,
"year": 1998,
"day": 1
},
"metadata": {
"source": {
"id": "f350f568dd11db1",
"type": "CONTACT"
},
"primary": true
},
"text": "Jan 1, 1998"
}
],
"resourceName": "people/c1095798948755479985",
"etag": "<etag>"
},
{
"birthdays": [
{
"metadata": {
"source": {
"id": "3652e00f0d28c9f4",
"type": "CONTACT"
},
"primary": true
},
"text": "random string accept"
}
],
"resourceName": "people/c3914437381388290548",
"etag": "<etag>"
}
]

Answer 1

The birthday field, can take both Date or text, and are not guaranteed to be the same.