In a Looker table calculation custom expression you can compute the max or min value of a date time object using an expression like this:
max(
(100 * 100 * 100 * 100 * 100 * extract_years(${table.created_at})) +
(100 * 100 * 100 * 100 * extract_months(${table.created_at})) +
(100 * 100 * 100 * extract_days(${table.created_at})) +
(100 * 100 * extract_hours(${table.created_at})) +
(100 * extract_minutes(${table.created_at})) +
(extract_seconds(${table.created_at}))