Fix date precision for start and end times

[jvfe]

The issue was that the precision value wasn't getting passed to the date qualifier.

This fixes that and adds a test case to ensure it's working now - even though I'm not very familiar with this way of writing test cases.

• fix: Pass precision to DateQualifier

• test: Add test for date with lower precision

• Closes #50

[cthoyt]

Thanks for picking this up @jvfe 🚀