KITFORMA · EDITORIAL ANSWER
How do I query a whole day without missing fractional-second timestamps?
KitForma editorial guide. An inclusive upper bound such as 23:59:59 misses values with later fractional seconds and depends on timestamp precision.
Step-by-step answer
An inclusive upper bound such as 23:59:59 misses values with later fractional seconds and depends on timestamp precision.
Use a half-open interval:
created_at >= start AND created_at < next_start. Calculate both boundaries in the intended timezone and convert consistently for storage. Test the final microsecond before midnight and the first instant of the next day. A local day around a daylight-saving change need not be exactly 24 hours. Avoid wrapping an indexed timestamp in a date conversion unless you have measured the resulting plan or provided a suitable expression index.Sources and verification
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