Dates and Times in PACSonWEB

About Dates and Times in PACSonWEB

PACSonWEB is an application in which dates and times are frequently used (study dates, logging dates, etc.). With a global user and customer base, all potentially in different time zones, we need to handle these dates and times carefully.

As a user you will see all dates and times in your own time zone. You will also need to provide all dates and times in your own time zone. Examples of these instances are:

• Displayed study dates and times in the viewer,

• study list,

• using filters in the study or worklist,

• entering dates and times in the study administration.

The advantage is that as a user you do not have to take into account time zone differences of studies or calculate the potential time differences yourself.

• All dates and times received by PACSonWEB from customers will be interpreted in that customer's time zone.

• All date and time data that we export back to any user or system will be interpreted that customer's time zone.

This means that if you have a study list containing studies from different time zones, studies from 1 minute ago in any of the time zones will all appear as the most recent.

Two studies created at exactly the same time, in two different time zones will appear in PACSonWEB as shown in the table below.

Study created	Date and time in PACSonWEB
Study created in Sao Paulo on the 15th of January at 22:00 Local Sao Paulo time (UTC -3 hours)	Jan 15th 22:00 in Sao Paulo
Study created in Brussels on the16th of January at 02:00 local Brussels time (UTC + 1 hour),	Jan. 16th 02:00 in Brussels

This principle applies to any date or time that is used in PACSonWEB, with a few exceptions:

• Date of birth will never be converted from and to any time zone.

• Raw DICOM tags shown in the DICOM tags dialog will be shown as raw information and not converted (e.g. study date = "20240115" and study time ="2200" ), but the UTC offset will be added in the DICOM tags.