Kala (Time) is like an arrow speeding from past to future. Related to Rhythm or universal order, time is connected to Siva, who is called Maha Kala. Kali, his consort personifies the energy aspect of time. Shiva’s personalised forms represent the timeless, formless, imperishable lingam (half sphere) or jyoti (light/energy)

Day from prana

One respiration is a prana. Six prana equal one vinadi. Sixty vinadis equal one nadi, (also known as a ghatika). Sixty nadis equal one sidereal day.
one sidereal day = sixty nadis = 23h 56m 03.4446s
one nadi (ghatika) = 60 vinadi = 23m 56.06s
vinadi = 23.93s
one prana = 3.99s

Vedic Six and Sexagesimal system

A day into 60 equal parts called ghatikas. (means little jar or water clocks ) A ghatika is further divided into 60 vinadikas.
60 days = I rithu or season
1 year = 6 rithus or seasons
60 years cycle of Jupiter and Saturn to align.
The Vedic Indians had a six‐day week and 60 weeks per year.

Week

The Vedic Indians had a six‐day week.
The ancient Egyptians had a ten‐day week.
The ancient Babylonians who started the month on the day after the new moon, had the first, eighth, fifteenth and the twenty second day marked out for religious services. This was a kind of seven‐day week with sabbaths, but the last week might be of eight or nine days duration, according as the month, which was lunar, had a length of 29 or 30 days.
The ancient Iranians had a separate name for each day of the month, but some days, at intervals of approximately seven, were marked out as Din‐i-Parvan, for religious practices. The pattern followed appears to have been similar to the Babylonian practice.
The continuous seven‐day week was evolved on astrological grounds by unnamed Chaldean astronomers, long before the first century AD. Every one adopted it.

Calendars

Cyclic Nature of Time - Yugas

Time neither has a beginning nor an end. It is cyclic, as all physical phenomena, are repetitive, cyclic, and follow a definite time duration. Yugas means alignment of planets and/or stars and/or their apogees and perigees.

MahAyuga – from Puranas

Some mythological figures: 1 pithru (ancestor) Day = 1 lunar month
1 Deity Day (day and night) = 1 year
1 Deity Year = 360 earthly years
1 Chatur yuga = 4,320,000 years
1 Manvantara = 71 Chaturyugas = 306,720,000
A Brahma's day = 1000 Chatur yugas = 4,320,000,000 years = 14 Manvantara
1 Brahma Day (day and night) = 2 Kalpa
Note: These figures are related to few constants, 12, 108 and 360