Day number (daynumber)
Returns the number of the day in the month from a given timestamp. This count starts from 1, differing from the Day of the month operation, which starts from 0. Optionally, you can check it in a time zone different than yours.
How does it work in the search window?
Select Create column in the search window toolbar, then select the Daynumber operation.
If you only add the Timestamp argument, you will get the day number considering your current timezone. Optionally, you can specify a different time zone adding the Time zone argument to see the day of the month in the specified time zone. When assigning a time zone different to yours, pay special attention to the original timestamp of the event, as the result may imply a day shift in the time zone specified.
You can either select a column with that data type or introduce it manually.
In case you want to introduce it, note that this value should be a date: Year-Month_Day Hour:Minute:Second.Millisecond (yyyy-MM-dd HH:mm:ss.SSS) → You can skip seconds and milliseconds.
You need a valid string format the app can recognize so it returns meaningful results. If you leave the field empty or introduce a value the app cannot recognize, the default Time Zone is UTC. You can use one of the following methods:
Be aware that some of the codes coincide, as CST could mean Central Standard Time or China Standard Time. In that case, it would be advisable to avoid using codes and introduce any of the other formats mentioned.
The data type of the new column values will be integer and the values shown will be 1-31.
Be aware that timestamps taking place during summer will be affected in the time zones in which they set the clock forward during summer. For example, Europe/Madrid (CET-Central European Time), which is UTC+1, becomes UTC+2 during summertime and thus timestamps in August will be affected when using that time zone. Be also aware that summertime differs between the Northern and Southern Hemispheres.
In the s
iem.logtrust.web.activity table, we want to create a column that indicates the day of the month of the dates in our eventdate column. To do it, we will create a new column using the Daynumber operation.
The arguments needed to create the new column are:
- Timestamp - eventdate column
Let's say we need to adapt the time zone to Central European. Click New Argument to specify a Time Zone.
Click the pencil icon and specify the time zone (CET or Central European Time) or any other.
Click Create column and you will see the following result:
How does it work in LINQ?
Use the operator
as... and add the operation syntax to create the new column. These are the valid formats for the Day of the week operation:
daynumber(timestamp)→ Use this expression to get the day of the month corresponding to the given timestamps, according to your current time zone.
daynumber(timestamp, timezone_string)→ Use this expression to get the day of the month corresponding to the given timestamps, according to the specified time zone.
You can copy the following LINQ script and try the above example on the
from siem.logtrust.web.activity select daynumber(eventdate, "CET") as eventdate_day_number