What term works best for unset start/end dates in a range?

1. What is a date range?
2. How do you present a date range?

What is a date range?

/ˈdeɪt ˌreɪndʒ/ a number of dates that includes a particular start and finish date and all dates in between: You can specify a date range when you search.

How do you present a date range?

For ranges, if "to present" or "–present" is used, the current year (or, in cases where necessary, date) of "present" at the time of writing should be included. Thus 1982–present (as of 2023)—if writing in 2023—is preferable to 1982–present. If the "from" date has an internal space, a spaced en dash is used.