I am looking for a very simple explanation as to how the date and time are handled in RSX-11? Just a short description which is parallel to what is here about RT-11. In RT-11, the date and time are two very separate quantities. There is no interaction between the two except: (a) When the user requests the time, the size of the time value is checked to see if it exceeds "24 hours" (b) If the time exceeds "24 hours", the time is reduced by "24 hours" and the date is incremented by ONE day, the algorithm dependent on if the SYSGEN has rollover for end of month (and after 31-Dec-99) included or not. The DATE command accepts dates from 01-Jan-73, although the date of 01-Jan-72 is displayed correctly in the DIR utility. For non-Y2K versions of RT-11 (V5.6 and prior), the DATE command accepts and displays dates up to 31-Dec-99. For Y2K versions of RT-11 (V5.7), the DATE command accepts and displays dates up to 31-Dec-2099. The DATE value is kept in a location within the resident monitor and may be requested by any program via a .DATE request. The USR tags a newly created file with the current DATE value (whatever quantity is in the DATE value - no checking is done), otherwise, the DATE is not used or manipulated by the operating system (except as noted in b above) and the DATE command. Other than the utilities (DIR, PIP, etc.) which look at the DATE and especially look at the creation date of a file (which is not actually looking at the actual date - but the DATE value at the time when the file was created), RT-11 does not care about or use the DATE in any manner and the operating system is totally independent of the quantity in the DATE value and unaffected by that quantity. I guess that changing the creation date of a file via PIP to be the current DATE value via the SET option in PIP is an exception, but no different than what happens when the USR creates a files and uses the current DATE value as the creation date. There could be application programs set up by the user which do more than simply display or set the DATE value. DATIME.SAV only does what the DATE command does, but a program executing as a system job could do much more. In general, I want to ignore such possibilities in both RT-11 and RSX-11. One other very minor aspect. In RT-11, the LTC is used to increment the time at either 50 or 60 Hertz. The time value is available to the user in ticks. An RT-11 program can request certain time based operations in terms of the number of ticks. Does RSX-11 have similar types of things available? Sincerely yours, Jerome Fine RT-11/TSX-PLUS User/Addict