Storage of date and time in the DeltaV Continuous Historian and Event Chronicle databases

Time stamps are stored in the DeltaV Continuous Historian and Event Chronicle databases using Greenwich Mean Time (GMT). DeltaV Reporter supports viewing time stamp data in three ways:

• GMT – Dates and times are presented as they were recorded by the DeltaV Continuous Historian.
• Local Time – Dates and times are presented in the user's local time as it applied at the time of the recording. For example, if the event occurred during daylight saving time, it will be presented showing the daylight saving local time even when viewed outside daylight saving time.
• GMT Offset – Dates and times are presented with a fixed, user-configurable, offset (±hh:mm) from GMT. This offset will be constant, and will disregard daylight saving time. This mode would be useful where data is viewed in a different locale from where it was recorded. It will allow the data to be viewed in an approximation of the local time of the plant.