When you are given the option to insert a date/time into the API you have a number of options allowing. This page outlines some of the options which are permitted. If a date cannot be determined from your passed string, the current date/time will be used.
The list below outlines all the possible options:
yyyy-mm-dd- will enter with the time as midday
yyyy-mm-dd hh- will enter the minute as 0
yyyy-mm-dd hh:mm- will enter the seconds as 0
yyyy-mm-dd hh:mm:ss- will enter the timezone as UTC
yyyy-mm-dd hh:mm:ss +0800- will assume you are passing time as 8 hours ahead
You can also use a massive range of other options. The list below just provides some of the options available to you however we always recommend using the options above to ensure accuracy when adding your data. These options will always work with UTC although we are exploring options to allow you to specify a timezone.