| A | ↘ | F | TimePeriodHelper got worse |
| ⇢ | C | TimePeriodHelper::diff() added | |
| ⇢ | C | TimePeriodHelper::intersect() added | |
| ⇢ | C | TimePeriodHelper::isOverlap() added | |
| ⇢ | B | TimePeriodHelper::contact() added | |
| ⇢ | A | TimePeriodHelper::greaterThan() added | |
| ⇢ | A | TimePeriodHelper::lessThan() added | |
| ⇢ | A | TimePeriodHelper::union() added | |
| ⇢ | A | TimePeriodHelper::dataSortOut() added |