Can I extend my 60-day visa exempt stamp in Thailand before it expires?

A UK citizen with a 60-day visa exempt stamp expiring on April 9th is seeking advice on whether they can extend this stamp by 30 days at the local immigration office before the expiry date. Community responses suggest that it is advisable to avoid waiting until the expiry date to apply for an extension. Some comments indicate that different immigration offices may have varying timelines, with some allowing extensions 30 to 45 days in advance, while others may only require you to apply 7 days before expiry.