Seasonal picks the holiday effect from the date, using an NTP clock set to the follow_me_timezone substitution (default UTC). Dates: New Year's, Valentine's, St. Patrick's, Easter (Good Friday to Easter Monday), Haunted and Halloween, Hanukkah (computed from the Hebrew calendar), Christmas and Autumn. Other days show the plain glow. The date logic was checked against independent Hebrew-calendar and Easter libraries for 2020 to 2060. Autumn gets falling, swaying, tumbling leaves with periodic gusts and a brown leaf color. Candy Cane gets a gloss glint, Easter a shimmer and sparkles, Valentine's rising hearts, New Year's fireworks, and Halloween a bat flyby and lightning. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>