FolderWorkflow document template enhancement supporting date math

This concerns an enhancement for the standard folder/document workflow so that when creating documents based on templates, it has the ability to default date properties to a future date/time by using a modified $now parameter using specific date math.

With this improvement the FolderWorkflowImpl will additionally support a date field variable expansion using the following form:

• $now: the current time, optionally followed by math functions using the following time units:
  • Y - Year
  • M - Month
  • D - Day
  • H - Hour
  • MIN - Minute
  • SEC - Second
  • MIL - Millisecond

Some example usages are:

• " $now/H" - Round to the start of the current hour
• "$now/D" - Round to the start of the current day
• "$now+2Y" - Exactly two years in the future from now
• "$now-1D" - Exactly 1 day prior to now
• "$now/D+6M+3D" - 6 months and 3 days in the future from the start of the current day
• "$now+6M+3D/D" - 6 months and 3 days in the future from now, rounded down to the nearest day

This enhancement has been contributed by Victor Batsu, thanks!