Handling times and dates in Tinytag Explorer
Information about time and date settings.
Time and date
The time and date in a data logger is set at the start of every logging run and is taken from the clock of the PC the unit is started on. If the time or date of the PC clock is set incorrectly then the recorded data will be displayed with the wrong time or date so it is important to ensure that the time and date on the PC is always set correctly.
The clock accuracy for Tinytag Talk 2, Ultra 2, Plus 2, View 2 and CO2 data loggers at 25°C is ~20ppm (which equates to a maximum drift of ±1.73s/day).
At other temperatures the clock accuracy is as follows:
-10 to +60 deg C: ±50ppm (±4.32s/day)
-30 to +80 deg C: ±130ppm (±11.232s/day)
Tinytags are not aware of the time zone where they were launched. So, for example, data from a logger launched at 18:00 in London will show a start time of 18:00 when viewed in New York.
Daylight saving changes
The times displayed by Tinytag Explorer are calculated when the data is displayed and depend on the daylight saving settings of the PC at that time. For example, if a .ttd file is opened before and after DST settings change, then all times displayed by Tinytag Explorer will go forward or back.
The advantage of this approach is that the relative time information is always correct. For example if a logger is set to record once every 24 hours and is left running during a DST transition all the timestamps will be 24 hours apart.
Unfortunately this approach means historic data may appear wrong if DST has changed since the data was recorded. For example a ttd file from a logger that records every 18:00 GMT in the winter will display 18:00 when viewed in the winter but 17:00 when viewed during the summer.
Note: describing how the data is displayed by Tinytag Explorer on PC's in countries that apply different DST rules to those where the logger was launched is beyond the scope of this article. Contact firstname.lastname@example.org if you require an explanation of this.
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