Hi everybody, 

I am working on a new module to round time hours to 1:00 1:15 1:30 etc...

This module is based on hr_attendance check_in end check_out times...

if attendance.check_out:
    delta = datetime.strptime(attendance.check_out, DEFAULT_SERVER_DATETIME_FORMAT) - datetime.strptime(attendance.check_in, DEFAULT_SERVER_DATETIME_FORMAT)
    roundTo = float(900)
    rounding = (delta + roundTo / 2) // roundTo * roundTo
    attendance.worked_hours = strftime('%H:%M', gmtime(rounding))

File "c:\program files (x86)\odoo v11\server\odoo\addons\3e_heures_CAPEB\models\models.py", line 46, in _compute_worked_hours
    rounding = (delta + roundTo / 2) // roundTo * roundTo
TypeError: unsupported operand type(s) for +: 'datetime.timedelta' and 'float'