maxDate
This function is used by Ignition's Expression language.
Description​
Finds and returns the maximum date in the given column of the given dataset, or the max value in a series of dates specified as arguments. When looking up the max date in a dataset, the column may be specified as an index or as a column name. Any null values in the column are ignored.
Syntax (index)​
maxDate(dataset, columnIndex)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| Dataset | dataset | The starting dataset to search. |
| Integer | columnIndex | The index of the column to search for the max date. Must be a column index of the provided dataset. |
Returns​
Date - The maximum date of the given date column in the given dataset.
Syntax (name)​
maxDate(dataset, columnName)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| Dataset | dataset | The starting dataset to search. |
| String | columnName | The name of the column to search for the max date. Must match a column name in the provided dataset. |
Returns​
Date - The maximum date of the given date column in the given dataset.
Syntax (date)​
maxDate(date[, date])
Parameters​
| Type | Parameter | Description |
|---|---|---|
| Date | date | A date. Can be as many dates as needed. |
Returns​
Date - The maximum date of the given dates.
Examples​
The following table applies to the code snippet below:
| AlarmTime | Path | Severity |
|---|---|---|
| 2010-01-08 7:28:04 | Tanks/Tank5/TempHiAlarm | 4 |
| 2010-01-08 10:13:22 | Tanks/Tank38/LoLevel | 2 |
| 2010-01-08 13:02:56 | Valves/Valve2/ | 2 |
Code Snippet
maxDate({Root Container.Table.data}, "AlarmTime") //You could use this expression to get the date and time for the most recent alarm.
Code Snippet
maxDate(now(0), addMinutes(now(0), 5)) // This would return the Date that is 5 minutes from now.