Fix Location Callback Schema example

[wuppious]

Change timestamp from Date to ISO-8601 UTC string.

[christocracy]

There is the Javascript schema provided to events (such as onLocation), which is provided a JavaScript Date instance, and the HTTP schema, which is provided the ISO 8601 String. This seems correctly documented to me.

[wuppious]

react-native-background-geolocation/src/declarations/interfaces/Location.d.ts

Lines 130 to 133 in 7745a0c

	/**
	* `ISO-8601 UTC` timestamp provided by the native location API.
	*/
	timestamp: string;

The interface Location specifies that timestamp property is of type string and is in fact provided an ISO 8601 string in the onLocation listener callback.

[woodybury]

@christocracy I am also getting string instead of js date from onLocation callback

[chrisdrackett]

I just came here to open this same PR. If there are two different formats returned by different things maybe this should list both and link them correctly?

[chrisdrackett]

I'm using this from BackgroundGeolocation.getCurrentPosition fyi, I'm getting an ISO-8601 string for timestamp:

"2021-07-22T22:12:02.393Z"

[christocracy]

It will remain String.

Create your own new Date(timestamp) instance.

The docs will be updated.