What date are you looking at?

Source: The Tibetan–Gregorian crosswalk comes from the Tibetan, Gregorian and Chinese Lunar Calendar Comparison (1951–2050). Monasteries, traditions and other calendars may differ.
Which day is “today”: Your device time zone or Beijing time decides which Gregorian day is “today”, which is then looked up in the same source. Tibetan dates are not recalculated for your location.
Observances: They follow the actual Tibetan month and day: annual observances never fall in a leap month, a repeated day carries its observance on the first occurrence, and an observance on a skipped day moves one day earlier.
Eclipses: Filed by Beijing date; whether you can see one depends on where you are.

Date basis