How to determine if a date is in an interval?

Question

Delphi

There are 3 text dates. Start date, end date, check date.
Each date consists of a month and a year. For example 08.2016.
How to determine the occurrence of the date being checked, in the interval of the start date and end date? Inclusive.
i.e. Start Date<=Checked Date<=End Date

Answer 1

Use DateInRange instead of comparisons.
If you need to add days, then everything is already implemented in the language. Apply StartOfTheMonth to the start date, EndOfTheMonth to the end date.

Answer 2

Seems to have figured it out.
You just need to convert everything to months. And compare these numbers.