Clock, Language, and Region-> Region and Language
If you forgot or don't yet know, there's a date format setting for 2-digits year. i.e.:
Control Panel
Clock, Language, and Region-> Region and Language
On the shown dialog, press the "Additional settings" button.
On the sub dialog, switch to the "Date" tab.
The setting is in the "Calendar" group (bottom of dialog).
By default in Windows 7, it's set to 2029.
FYI, Windows 11's default setting is 2049.
So that can be used as a guide for the new common default setting.
On 2026/6/13 22:3:17, JJ wrote:
If you forgot or don't yet know, there's a date format setting for 2-digits >> year. i.e.:
If anyone else is wondering what this is about, it's how Windows
interprets it when you enter a two-digit year. (I haven't used two-digit years since before y2k, but I suppose some people - perhaps especially
in USA? - still do.)
Control Panel
Clock, Language, and Region-> Region and Language
On the shown dialog, press the "Additional settings" button.
On the sub dialog, switch to the "Date" tab.
The setting is in the "Calendar" group (bottom of dialog).
By default in Windows 7, it's set to 2029.
FYI, Windows 11's default setting is 2049.
So that can be used as a guide for the new common default setting.
In my Windows 10 (took me ages to find it!), it's the same as 11 - i. e.
a two-digit year is assumed to mean a year between 1950 and 2049. (It's
the latter date you set; the former is then calculated.)
On 14/06/2026 4:26 pm, J. P. Gilliver wrote:[]
[]If anyone else is wondering what this is about, it's how Windows
interprets it when you enter a two-digit year. (I haven't used two-digit
years since before y2k, but I suppose some people - perhaps especially
in USA? - still do.)
What happens if you set that latter date to 2099??FYI, Windows 11's default setting is 2049.
So that can be used as a guide for the new common default setting.
In my Windows 10 (took me ages to find it!), it's the same as 11 - i. e.
a two-digit year is assumed to mean a year between 1950 and 2049. (It's
the latter date you set; the former is then calculated.)
Is 2049 when Microsoft expect everyone to have left Win-11??
If you forgot or don't yet know, there's a date format setting for 2-digits year. i.e.:
Control Panel
Clock, Language, and Region-> Region and Language
On the shown dialog, press the "Additional settings" button.
On the sub dialog, switch to the "Date" tab.
The setting is in the "Calendar" group (bottom of dialog).
By default in Windows 7, it's set to 2029.
FYI, Windows 11's default setting is 2049.
So that can be used as a guide for the new common default setting.
-a-a-a-a >> click the rCLCustomizerCY buttonRegion and Language Options
-a-a-a-a >> switch to the rCLDaterCY tabRegional Settings
Thank you for the reminder.
I have also updated my VMs containing these versions of Windows:
Windows XP
==========
Control Panel
aaaa >> click the |Customizei buttonRegion and Language Options
aaaaaaaa >> switch to the |Datei tab
The setting is in the |Calendari group (top of dialog).
Windows 98
==========
Control Panel
aaaa >> switch to the |Datei tabRegional Settings
The setting is in the |Calendari group (top of dialog).
In my Windows 10 (took me ages to find it!), it's the same as 11 - i. e.
a two-digit year is assumed to mean a year between 1950 and 2049. (It's
the latter date you set; the former is then calculated.)
On Sun, 14 Jun 2026 07:26:34 +0100, J. P. Gilliver wrote:
In my Windows 10 (took me ages to find it!), it's the same as 11 - i. e.
a two-digit year is assumed to mean a year between 1950 and 2049. (It's
the latter date you set; the former is then calculated.)
Using the Start Menu's search feature seems to be faster, using `date` keyword. That'll show a result entry which is something like "Change date
and time format".
It seems that, it was applied starting in either Windows 10 version 1809 or version 1903/19H1. I don't know exactly since I don't have the version 1809. Earlier versions (version 1803 and older) are still using 2029.
The 2-digits year setting itself was implemented starting in Windows 98. There's none yet in Windows 95 OSR2 and Windows NT 4.0 SP6.
On 14/06/2026 4:26 pm, J. P. Gilliver wrote:
On 2026/6/13 22:3:17, JJ wrote:What happens if you set that latter date to 2099??
If you forgot or don't yet know, there's a date format setting for
2-digits
year. i.e.:
If anyone else is wondering what this is about, it's how Windows
interprets it when you enter a two-digit year. (I haven't used two-digit
years since before y2k, but I suppose some people - perhaps especially
in USA? - still do.)
Control Panel
Clock, Language, and Region-a-a-a -> Region and Language
On the shown dialog, press the "Additional settings" button.
On the sub dialog, switch to the "Date" tab.
The setting is in the "Calendar" group (bottom of dialog).
By default in Windows 7, it's set to 2029.
FYI, Windows 11's default setting is 2049.
So that can be used as a guide for the new common default setting.
In my Windows 10 (took me ages to find it!), it's the same as 11 - i. e.
a two-digit year is assumed to mean a year between 1950 and 2049. (It's
the latter date you set; the former is then calculated.)
Is 2049 when Microsoft expect everyone to have left Win-11??
Just reading some of the later posts on this thread and I was reminded
of the 'year 2038 problem' ....
https://en.wikipedia.org/wiki/Year_2038_problem
where the Clocks of some Computers/Computer System might run out of
'Ones' and 'Zeros' in their Time-keeping systems.
Has this been fixed/delayed by going to more and more bits??
Windows 3.x and older (16-bit), relies on underlying MS-DOS system.
MS-DOS date limit is year 2099 - which also higher than 32-bit time_t.
File systems and network protocols may have lower date limit.
On Wed, 17 Jun 2026 15:07:37 +0700, JJ wrote:
[snip]
Windows 3.x and older (16-bit), relies on underlying MS-DOS system.
MS-DOS date limit is year 2099 - which also higher than 32-bit time_t.
File systems and network protocols may have lower date limit.
The DOS date is stored in 16 bits, as 5 bits for the day, 4 bits for the month. That leaves 7 bits for the year (based on 1980). That gives a range of 128 years, 1980 - 2107.
BTW, time is in another 16 bits. 5 bits for hour, 6 bits for minute, 5
bits for second (2 second resolution).
| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 70 |
| Nodes: | 6 (0 / 6) |
| Uptime: | 01:17:33 |
| Calls: | 949 |
| Calls today: | 1 |
| Files: | 1,325 |
| Messages: | 280,983 |