Skanda Ṣaṣṭhī · the bright sixth lunar day
Skanda Ṣaṣṭhī
Skanda is the son of Śiva and Pārvatī and is especially beloved as Murugan in Tamil traditions. Monthly observance may include fasting, prayer, recitation, pilgrimage, or pūjā according to one's tradition and circumstances.

What Open Pañcāṅga checks
This guide checks for Śukla Ṣaṣṭhī at local sunrise.
Ṣaṣṭhī means the sixth tithi. We show the observance on the local date when Śukla Ṣaṣṭhī, the sixth lunar day of the bright waxing fortnight, prevails at sūryodaya, local sunrise.
Why another calendar may choose a neighboring date
Some Murugan calendars use extra rules when Pañcamī and Ṣaṣṭhī meet.
A temple or traditional calendar may examine how Pañcamī and Ṣaṣṭhī span two sunrises and use more than this simple sunrise test. Such a result reflects a different documented calendar rule applied to the same astronomy. The major annual Skanda Ṣaṣṭhī in Kārttika also requires the correct lunar month and additional reviewed rules.