TimeSpan settings in *.ffs_gui files

[WiBoBnl]

Hello,
Where can I find the syntax of TimeSpan in the *.ffs_gui files?
Usually it says: <TimeSpan Type="None">0</TimeSpan>.
But I assume there are more types than “None,” and what is the unit of the value (0 in this case)?
Thanks in advance.
Wim from the Netherlands

[Gianni1962]

You can manage the "Time span" in the "Filter" panel in "Synchronization Settings".

[WiBoBnl]

Thanks Gianni.
Next question: Is it also possible to sync all files before a certain date, for example, everything before January 1, 2023?

[Plerry]

Right-click in the left or right column header of the Compare results, and then "Select time span".
See https://freefilesync.org/manual.php?topic=tips-and-tricks#select-time-span

Set your left/from date as early as applicable,
and your right/to date to January 1, 2023 (or December 31, 2022)

[therube]

Yes, but does that (the time-span) get saved in .ffs_gui or .ffs_batch, or is it only applicable during the (GUI) scan itself?

(It did not seem to affect .ffs_gui or .ffs_batch, when I looked.
<TimeSpan Type="None">0</TimeSpan>
remained unaffected.)

[Plerry]

I considered WiBoBnl's second question as a separate question, unrelated to his first question on time-span syntax.

> but does that (the time-span) get saved in .ffs_gui or .ffs_batch

Never tried, but I don't think so.
But that is probably not very important, because, unlike the Today/This month/This year/Last x days time-span syncs, these From/To Date time-span syncs are generally one-time syncs.
Or at most, you would re-run such a sync with modified Date time-span settings.