aCalendar+ is the premium version of aCalendar - please try the free calendar app aCalendar first!

EXTRA FEATURES (aCalendar+ or as In-App-Purchase)
● Public holidays (and school holidays for some countries) - configurable in the calendar list
● Color themes (UI and Widget colors, dark background - NOT event colors: those are defined by your calendar service)
● Business features (Invite attendees, link contacts, free/busy, private, profiles, share as ICS, ...)
● Tasks (manage Google Tasks or tasks from CalDAV/OpenTasks)
● No ads (removes the occasional advertisement)
♥ Tapir Apps donates 10% of all revenue (app purchase, IAP, ads) to rainforest conservation through our friends at World Land Trust

FEATURES
● intuitive navigation with smooth transitions
● day, week, month and year view
● Fullscreen widgets
● flexible recurrences like every 3 weeks, every 17 days, or every Mon, Wed and Fri
● 48 colors per calendar
● per-event colors (if supported by the event's calendar)
● custom event font size
● birthdays & anniversaries with photos from your addressbook and editing
● uses Android's native calendar backend and synchronization
● no battery drain through polling
● moon phases and zodiac signs for birthdays
● QR barcode sharing of events
● 12/24h clock honoring system settings
● optimized text display and improved line-break

VirusTotal: https://www.virustotal.com/gui/file/584e1a565563af86a8dd7e494a2039bf767a7c46477e462a5fa4762e42904d73