The Church of Jesus Christ of Latter-day Saints | Green Day | One Day International | New Year's Day | Boxing Day | Memorial Day | Seventh-day Adventist Church | Labor Day | Guiding Light | Doris Day | Earth Day | May Day | Sandra Day O'Connor | Electric Light Orchestra | Valentine's Day | light rail | Edmonton Light Rail Transit | Record Store Day | Mother's Day | light curve | Ferris Bueller's Day Off | Bastille Day | Six-Day War | April Fools' Day | Australia Day | Light-emitting diode | Father's Day | Brightest Day | Big Day Out | Macy's Thanksgiving Day Parade |
: Season 4 (1999–2000) - "The Harsh Light of Day"; "The Initiative"; "Pangs"; "Restless"