Exporter Temporal Alignment

[ivanzvonkov]

Context
For each coordinate a time series is generated starting from start_date and ending at end_date. To obtain each time step the current strategy involves incrementing the date by 31. A time series from Jan 2020 to Dec 2021 then looks like this:

Timestep 0: 2021-01-01 -> 2021-02-01
Timestep 1: 2021-02-01 -> 2021-03-04
Timestep 2: 2021-03-04 -> 2021-04-04
Timestep 3: 2021-04-04 -> 2021-05-05
...
Timestep 23: 2022-12-15 -> 2023-01-15

Issue
A time series starting at a different time does not align with this time series. Eg. one starting Jan 2021:

Timestep 0: 2022-01-01 -> 2022-02-01
...
Timestep 11: 2022-12-08 -> 2023-01-08

Potential Solution
This can be addressed by incrementing by month instead of by 31 days.

Relevant code here

openmapflow/openmapflow/ee_exporter.py

Line 117 in d96c9f1

cur_end_date = cur_date + timedelta(days=days_per_timestep)