I'm in the proccess of configuring UMDS to share ESX patches for 4 different vCenters (sharing the download folder; no -E needed... I hope)
I haven't tested yet (I will), but I'm not sure this works for "NEW" patch releases. Just reading documentation (pasted below), it seems that -s and -t arguments works when you want to REdownload some patches between certain dates. In fact, I think those dates really mean when you downloaded certain patches, not the day they were released.
Anyway, I'm not sure... it's my interpretation of the documentation, so I will test it and let you know.
Optional arguments for Export and Re-download:
+ --dest arg The destination directory for export operation+
+ (Overrides setting from initial configuration)+
+ -s arg For export and re-download, restrict selection to+
+* include updates downloaded* since this time+
+ (inclusive). Format is ISO-8601 YYYY-MM-DDThh:mm:ss[Z+
+ ]. Use 'Z' at the end to indicate UTC+
+ -t arg For export and re-download, restrict selection to+
* include updates downloaded* till this time
+ (inclusive). Format is ISO-8601 YYYY-MM-DDThh:mm:ss[Z+
+ ]. Use 'Z' at the end to indicate UTC+
If you have already downloaded updates and want to download some of them again, include start and
+ end time, to restrict the updates to download. For example, if you want to download the updates released+
+ in May, 2008, enter the following command:+
+ vmware-umds --re-download -start-time 2008-05-01T00:00:00 --end-time 2008-05-31T23:59:59+