Merge pull request mendix#5773 from mendix/yl-add-XPath-tokens

Add XPath time-related tokens

Author: Yiyun333

content/en/docs/refguide/modeling/xpath/xpath-constraints/xpath-keywords-and-system-variables.md

@@ -1,7 +1,7 @@
 ---
 title: "XPath Keywords and System Variables"
 url: /refguide/xpath-keywords-and-system-variables/
-tags: ["studio pro", "BeginOfCurrent"]
+tags: ["studio pro", "BeginOfCurrent", "system variables"]
 ---
 
 ## 1 Overview
@@ -67,6 +67,14 @@ The following tokens can be used to obtain a date and time value:
 | `[%BeginOfCurrentDayUTC%]` | The date and time at the beginning of the current day in UTC. |
 | `[%EndOfCurrentDay%]` | The date and time at the end of the current day. |
 | `[%EndOfCurrentDayUTC%]` | The date and time at the end of the current day in UTC. |
+| `[%BeginOfYesterday%]` | The date and time at the beginning of yesterday. |
+| `[%BeginOfYesterdayUTC%]` | The date and time at the beginning of yesterday in UTC. |
+| `[%EndOfYesterday%]` | The date and time at the end of yesterday. |
+| `[%EndOfYesterdayUTC%]` | The date and time at the end of yesterday in UTC. |
+| `[%BeginOfTomorrow%]` | The date and time at the beginning of tomorrow. |
+| `[%BeginOfTomorrowUTC%]` | The date and time at the beginning of tomorrow in UTC. |
+| `[%EndOfTomorrow%]` | The date and time at the end of tomorrow. |
+| `[%EndOfTomorrowUTC%]` | The date and time at the end of tomorrow in UTC. |
 | `[%BeginOfCurrentWeek%]` | The date and time at the beginning of the current week. |
 | `[%BeginOfCurrentWeekUTC%]` | The date and time at the beginning of the current week in UTC. |
 | `[%EndOfCurrentWeek%]` | The date and time at the end of the current week. |