Upon conviction of any violation of any provision of this code, other than a felony violation and except this section, execution of sentence of imprisonment in the county jail shall be suspended, at the request of the convicted person, for a period of 24 hours, unless the judge determines that the person would not return. If, prior to the end of such period, the person does not deliver himself into custody for commencement of the execution of such sentence, his failure to appear shall constitute a misdemeanor.
Source:
Section 42004.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=42004.5..