format

Formats date-time using strftime-style format text.

Example:

    Vala.Time.DateTime dt = DateTime.of (2024, 5, 10, 8, 30, 45);
    assert (Dates.format (dt, "%Y-%m-%d") == "2024-05-10");

Parameters:

t	date-time value.
fmt	format text.

Returns:

formatted date-time text.