Data Format
Data formats are standard and are defined by the SOAP specification.
A Note on Dates
SOAP uses YYYY-MM-DDTHH:MM:SS as the date/time format. For example, December 14 1984 12:14:37 would be 1984-12-14T12:14:37. You can (and should) specify a timezone offset if you do not want the system to assume you are providing a time in UTC (Universal Coordinated Time / Greenwich Mean Time). For the Eastern Time Zone on Daylight Savings Time, this would be YYYY-MM-DDTHH:MM:SS-04:00.
Note - The only time you should not use this date format is when working with fieldObjects of type date, or adding data for date fields when calling addContacts. In these case, the date format used should match the date format used in your account. You can find the date format used in your account by calling readAccounts with includeInfo set to true.

