1.) The time zone offset should not be followed by a "Z" (e.g. "YYYY-MM-DDThh:mm-hh:mmZ" is incorrect; "YYYY-MM-DDThh:mm-hh:mm" is correct). Note that appending "Z" to a time indicates it is in UTC (e.g. YYYY-MM-DDThh:mmZ) and is correct.
2.) The example "YYYY-MM-DDThh:mm-hh:mm-07:00" doesn't make any sense and is syntactically incorrect.
Two inaccuracies are being fixed here:
1.) The time zone offset should not be followed by a "Z" (e.g. "YYYY-MM-DDThh:mm-hh:mmZ" is incorrect; "YYYY-MM-DDThh:mm-hh:mm" is correct). Note that appending "Z" to a time indicates it is in UTC (e.g. YYYY-MM-DDThh:mmZ) and is correct.
2.) The example "YYYY-MM-DDThh:mm-hh:mm-07:00" doesn't make any sense and is syntactically incorrect.