HowTo: Adding relative dates to RelativeDateItem

[Blama]

Hi Isomorphic,

I'd like to add

• Current Month (=1st of month when in "from"-field, last of month when in "to"-field)
• Current Quarter (=1st of quarter when in "from"-field, last of quarter when in "to"-field)
• Current Year (=1st of year when in "from"-field, last of year when in "to"-field)
• Last month (....logic as above....)
• Last quarter (....logic as above....)
• Last year (....logic as above....)

to RelativeDateItem in 5.1p. How do I do this best? JS would also be OK here.
I don't need the "N xyz from now". If possible I'd also like to remove some or all of the default entries there.

Thank you & Best regards
Blama

[Isomorphic]

See relativeDateItem.presetOptions.