Gets the English display name of day of the week of a timestamp field.

asstringfalse_dayOfWeekNameThe name of the output field.
fieldstringfalse@timestampThe name of the input field. [a]
timezonestringfalse The time offset to use e.g., -01:00. If not specified, the query’s offset will be used.
timezoneFieldstringfalse@timezoneThe name of the field containing the timezone to use, if not specified the query's timezone will be used. This is ignored if the timezone parameter is passed as well. If this is not defined the timezone offset of the query will be used.

[a] If an argument name is not given, field is the default argument.