# Common Data Formats

## MSISDN

Members in our systems may be identified with their phone numbers (msisdns) according to [E.164](https://en.wikipedia.org/wiki/E.164).
We use the format (in most cases, we normalize it automatically) without leading `00` or `+` and without spaces, so that it contains only digits, i.e. `4740769126`.

## Date & time format

Unless stated otherwise, our systems recognize and return date in [ISO8601](https://en.wikipedia.org/wiki/ISO_8601) format.

Example: `2012-04-23T18:25:43.511Z` - 23rd of April 2012, 18:25:43 with 511 milliseconds in UTC timezone.