Correctly setting date on SCO Unix

UNIX SCO
1

Hello,
I use SCO Unix v5.0.6a and usually if I want to set date, I do it like this:
date 0616100026 to set date time to 16th June 2026 at 10:00 AM, somehow SCO unix knows the year is 2026 and not 1926.

However by looking at the manual page it seems that correct way is to use -t switch, like
date -t 202606161000, where this 20 is a number representing century (00-90) which means 20 means 21st century.

So I wonder does this have any practical significance? or these above mention commands are always equivalent considering there is no much sense to actually set year to 1926 or something like that.

2

In addition to setting the date:

#date -t 202606161410.00; setclk -r

Will update the cmos clock as well.

If you have time drift, you can add the following line to the root crontab which will perform the above on a scheduled basis.

0 23 * * * /etc/ntpdate site

where site is a local time server.

In answer to your question, though, if you try setting the date to 9506161410 you may find that the century is set to 19.

3

Thank you jgt, especially for the command to update cmos clock as well