Workbench 1.0
Workbench 2.04

These GUIs don’t have this feature.

DeskTop 1.1
GS/OS 5.0.4
GS/OS 6.0.1

These GUIs don’t have this feature.

BeOS R5.0.1 PE

This GUI doesn’t have this feature.

CDE 1.5 in Solaris 9

Calendar in CDE 1.5 in Solaris 9 (Calendar)

GEOS 2 for C64
GEOS 2.1 for Apple II

These GUIs don’t have this feature.

GeoWorks Ensemble 2.0

Calendar in GeoWorks Ensemble 2.0 (GeoPlanner)

NewDeal Office 3 Eval.

Calendar in NewDeal Office 3 Eval. (NewPlanner)

BreadBox Ensemble Lite

Calendar in BreadBox Ensemble Lite (Calendar)

GNOME 2.2.0 in RedHat 9

Calendar in GNOME 2.2.0 in RedHat 9 This calendar appears after clicking on the current time on the Panel (Linux equivalent of taskbar).

IRIX 5.3

Calendar in IRIX 5.3 (cal) with thanks to Ian Young. The screenshot is a reproduction.

Lisa OS 1.0
Lisa OS 3.1

These GUIs don’t have this feature.

System 1.1
System 3.0
System 4.2
System 7.0
System 7.5.3
Mac OS 8.0
Mac OS 9.0
Mac OS X DP
Mac OS X DP 2
Mac OS X DP 3
Mac OS X DP 4
Mac OS X Public Beta
Mac OS 10.0.4
Mac OS 10.1
Mac OS X Jaguar

These GUIs don’t have this feature.

Mac OS X Panther

Calendar in Mac OS X Panther (iCal)

OPENSTEP 4.2
Rhapsody DR2

These GUIs don’t have this feature.

MS OS/2 1.30.1

This feature is not yet documented on this site.

OS/2 2.1

Calendar in OS/2 2.1

OS/2 Warp 3

This GUI doesn’t have this feature.

OS/2 Warp 4

Calendar in OS/2 Warp 4

QNX 6.2.1 NC

This GUI doesn’t have this feature.

ArthurOS 1.2

Calendar in ArthurOS 1.2 (Diary) Clicking on any given date will allow to enter comments about it.

RISC OS 3.11
RISC OS 3.7

These GUIs don’t have this feature.

Sibo/Psion Series 3a

Calendar in Sibo/Psion Series 3a (Agenda)

Sibo/Psion Siena

Calendar in Sibo/Psion Siena (Agenda)

EPOC R5/Psion Revo

Calendar in EPOC R5/Psion Revo (Agenda) with thanks to Daniel Beardsmore

EPOC R5/Psion Series 7

Calendar in EPOC R5/Psion Series 7 (Agenda)

Windows 1.01

Calendar in Windows 1.01 (Calendar). The screenshot has an extra border (remove)(show) and wrong aspect ratio (correct)(ignore).

Windows 2.03

Calendar in Windows 2.03 (Calendar)

Windows 3.0

Calendar in Windows 3.0 (Calendar)

Windows 3.1

Calendar in Windows 3.1 (Calendar)

WfW 3.11
Windows NT 3.1 Workstation
Windows NT 3.51 Workstation
Windows 95
Windows 95B
Windows NT 4.0 Workstation
Windows NT 4.0 Server
Windows 98
Windows 98 SE
Windows 2000 Pro
Windows 2000 Advanced Server
Windows Me
Whistler 2257
Windows XP Pro
Windows Server 2003 Web

These GUIs don’t have this feature.

Longhorn 4015

Calendar in Longhorn 4015 This calendar appears after clicking on the clock tile in the Sidebar.