stop_time to end_time and NX_DATE_TIME

[ggoneiESS]

Issue

Changed stop_time to end_time and changed the time format from nanoseconds to ISO8601 in line wiht NX_DATE_TIME

Description of work

New method to account for the fact we are using a string rather than a time in the dataset (which is better in general anyway) and then use of to do the conversion for formats; chrono fortmat options would be best but that means C++20

Checklist

• [ x ] Changes have been documented in changes.md
• [ ] Documentation has been updated in documentation directory

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3837 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3834 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5695 3836 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5696 3837 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5694 3835 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5697 3838 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5697 3838 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5697 3844 67% For more detail see Cobertura report in Jenkins interface

[cow-bot]

Code Coverage (Lines Exec Cover) TOTAL 5697 3837 67% For more detail see Cobertura report in Jenkins interface

[ggoneiESS]

Let's discuss this tomorrow before the quick catch-up and the code hour? 0930? Writing NX_DATE_TIME as strings is actually quite a different puzzle compared to before, since it uses a very different NeXus data type. I also don't understand how we will write times (with timezones or UTC?)