Working with Dates
When working with dates, the Square API endpoints expect the following:
Dates in ISO 8601 format (YYYY-MM-DD). For example,
end_datein the DateRange type. The ShiftWorkDay.date_range field is of the
Timestamps (date and time) in RFC 3339 format. For example,
end_atin the TimeRange type. In the SearchOrders request body, the
query.filter.date_time_filter.created_atfield is of the
TimeRangetype. It can be:
UTC time "2013-01-15T00:00:00Z".
An offset from UTC time to indicate a time zone, such as "2013-01-15T00:00:00-08:00" (for 8 hours behind UTC time).
Clients must account for daylight savings time when providing offset dates.
The Square Connect V1 API is a deprecated API. If you're still using this API, note that in Connect V1, date and timestamp strings always use ISO 8601 format:
Fields that only require a date value can use YYYY-MM-DD notation. For example, "2007-04-05".
Fields that only require a time value can use 24-hour notation (HH:MM:SS). For example, "14:30:00".
Fields that require a data and time value use YYYY-MM-DDTHH:MM notation. For example, "2007-04-05T14:30".
If you need more assistance, contact Developer Support or ask for help in the Developer Forums.