Update Datepicker Descriptions

Author: pwseg

src/engage/journeys/journeys-analytics.md

@@ -39,10 +39,12 @@ Using the date picker, you can view a Journey's analytics over a specific period
 
 The following table shows descriptions of the timeframes you can select:
 
-| Timeframe       | Description (based on UTC)           | 
-| --------------- | ------------------------------------ |
-| Since yesterday | Yesterday at midnight until now      |
-| Last 7 days     | The past seven days, including today |
-| Last 30 days    | The past 30 days, including today    |
-| Last 90 days    | The past 90 days, including today    |
-| Last 180 days   | The past 180 days, including today   |
+| Timeframe         | Description (based on UTC)                                 |
+| ----------------- | ---------------------------------------------------------- |
+| Today             | Today, beginning at midnight                               |
+| Yesterday         | The day before today                                       |
+| Last 7 days       | The past seven days, not including today                   |
+| Last 30 days      | The past 30 days, not including today                      |
+| Last 90 days      | The past 90 days, not including today                      |
+| Last 180 days     | The past 180 days, not including today                     |
+| Custom date range | The period between two dates, including the selected dates |