Parse a time-of-day string back to minutes-since-midnight. Accepts
both 24h ("14:30") and 12h ("2:30 PM", "2:30pm", "2pm")
regardless of the user's clock_format setting — that setting only
controls display. Returns null on any invalid input so the caller
can reseed the field from the previous value.
Parse a time-of-day string back to minutes-since-midnight. Accepts both 24h (
"14:30") and 12h ("2:30 PM","2:30pm","2pm") regardless of the user'sclock_formatsetting — that setting only controls display. Returnsnullon any invalid input so the caller can reseed the field from the previous value.