राजवर्षं मासः पक्षो दिवसश्च व्युष्टम् वर्षाहेमन्तग्रीष्माणां तृतीयसप्तमा दिवसोनाः पक्षाः शेषाः पूर्णाः पृथगधिमासकः इति कालः ॥ कZ_०२.६.१२ ॥
rājavarṣaṃ māsaḥ pakṣo divasaś ca vyuṣṭam varṣāhemantagrīṣmāṇāṃ tṛtīya-saptamā divasonāḥ pakṣāḥ śeṣāḥ pūrṇāḥ pṛthag-adhimāsakaḥ iti kālaḥ
Time (for royal accounting) is reckoned as: the king’s year, month, fortnight, day, and the elapsed day. In the seasons—rains, winter, and summer—some fortnights are shorter by the 3rd or 7th day; the remaining fortnights are full. An intercalary month is counted separately. This is the time-standard.
To ensure uniform accounting periods across offices, enabling consistent reporting, reconciliation, and audit.
To prevent distortion of annual totals and to keep revenue/expenditure comparisons consistent across years.