pub fn format_date(recv: &Value, pattern: &Value) -> Option<String>Expand description
d.format(pattern): yyyy year, MM month, dd day, HH hour, mm
minute, ss second (two digits each), MMM the English month
abbreviation (Jan), EEE the English weekday abbreviation (Mon);
every other character is literal. Fields are read in the written offset;
a date-only value has 00 time fields.