Description of problem:
This is a very low-priority nitpick.
DatetimePicker in Report Template Generate form uses 12-hour time format. However, there is 24-hour format used in the confirmation message after submitting the form when "Send report via e-mail" is checked.

How reproducible:
Deterministic

Steps to Reproduce:
1. Monitoring -> Report Templates
2. Generate any report
3. Check "Send report via e-mail"
4. Notice that DatetimePicker in "Generate at" field uses 12-hour format.
5. Select any time.
6. Submit

Actual results:
You get a message in 24-hour format, e.g. "Report is going to be rendered at Tue, 28 May 2019 16:12:00 +0200 and it will be delivered via e-mail once ready."

Expected results:
I think the picker should use 24-hour format

Additional info:
This is so low severity that I think it is OK to be closed if you see fit