Total days
—
Calendar days between the two dates.
Months + days
—
Calendar months (not 30-day months).
Years + months + days
—
Human-friendly breakdown.
End earlier than start → treated as crossing midnight.
Cross-midnight: —
Total seconds
—
Exact span in seconds.
HH:MM:SS
—
Hours can exceed 24.
Days + hours + minutes
—
Nice for long spans.