Timing
Tithi vs calendar date: why they do not line up neatly
A Tithi is a lunar-day division based on the angular relationship of Moon and Sun. A calendar date is a civil-time label. Because they use different boundaries, a Tithi need not begin at midnight or last for exactly one local calendar day.

Read the interval, not only the name
If a calendar supplies beginning and end times, treat them as part of the result. A label copied without its interval can be misleading for an event later in the same day. Also check whether a number is a whole-cycle index or a within-fortnight label; different displays may organise the same calendar information differently.
Why the city still matters
The underlying lunar relationship is not made personal by changing a city, but the way its interval falls on a local civil day depends on time conversion and the calendar rule. Sunrise-based observance introduces another location-dependent step. Keep these layers distinct instead of assuming every displayed timing value has the same geographic meaning.
Avoid manual date shifting
Do not simply move an overseas festival or Muhurat date forward or backward by one day from an Indian screenshot. A proper result needs the relevant locality and rule. A time-zone conversion may change the date, while an observance rule may involve a particular part of the day. Those are separate checks, not one universal shortcut.
Use the right level of certainty
For a family or religious observance, confirm the applicable tradition with an appropriate local authority. For an app comparison, record the city, chosen date and method so a mismatch can be investigated. An educational Tithi article should not be presented as a current festival calendar or as proof that one community's observance is invalid.
Astrological interpretations are for reflection, not a diagnosis, a guaranteed prediction or a substitute for professional advice. Journal guides are prepared with AI assistance; they are educational content, not individual consultations.
Antaryami

