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Interface
Flat
Hotel
Time And Date, interface, Administration
Crimson
512x512
Birthday party
Calendar, Birthday And Party, Time And Date
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Metronome
Calendar, red
Plex
red, Calendar
Mixed
Higher Education Icon Set
Schedule, timetable, Calendar
256x256
Signs & symbols
Smooth
Super Mono Basic
Calendar, Basic, red
48x48
Desktop apps
Glyph
16x16 Free Toolbar Icons
week, Month, Schedule
16x16