His Name in Hebrew is spelled with four Hebrew letters, called the "Tetragrammaton".  Many thousands of times in Scripture this is His Name in Hebrew, represented here in English as yode-hay-vahv-hay phonetically speaking, or YHVH for short in English.

The Signs of the Times-DT- 03-22-10 - The Sign of Loyalty -PR- 13
The Sabbath question is to be the issue in the great final conflict, in which all the world will act a part. Men have honored Satan's principles above the principles that rule in the heavens. They have accepted the spurious sabbath, which Satan has exalted as the sign of his authority. But YHVH has set His seal upon His royal requirement. Each Sabbath institution, both true and false, bears the name of its author, an ineffaceable mark that shows the authority of each.

Genesis 1:14 And Elohim said, Let the lights in the firmament of the heavens separate the day from the night; and they will be for signs-(226-owth), and for seasons-(4150-moed-appointments), and for days, and years: Strong's #226 'owth, oth; prob. from 225 (in the sense of appearing); a signal (lit. or fig.), as a flag, beacon, monument, omen, prodigy, evidence, etc.:--mark, miracle, (en-) sign, token.

An Institution, concerning time, How He measures time, to arrive at His Shabats.
YHVH, "Y" The Father, "H" The Mother, "V" The Son, "H" The Daughter
Vav in the Tetragrammaton, represents The Son, Who at the beginning of creation week "paused" on the New Moon Day, before beginning His work of creation week. YHVH (Y=yod, H=hay, V=vav, H=hay) inhabits eternity, in this example He stands at the beginning of each weekly cycle, not occupying a day, but authoring time, His "Month", the four letters of His Name stands at the beginning of the four weeks of His lunar month, "Y" at the beginning of the first week of 7 days, "H" at the beginning of the second week of His "Month", "V" at the beginning of the third week of His "Month", "H" at the beginning of the fourth week of His lunar "Month".
Our Heavenly Father instituted His Divine Calendar, which bears His Holy Name.  He gives His calendar, encrypted, in Leviticus 1:1

He, Satan, changed the calendar using Roman authority to enforce this calendar change. Hillel, the last Sanhedrin president, fixed this changed calendar sabbath to "Saturday" which literally means in Chaldee "Satanday".

These texts show Saturn to be the star-planet of Satan, thus Saturday is Satanday.

Acts 7:43
43 Yea, ye took up the tabernacle of Moloch, and the star of your god Remphan(3594), figures which ye made to worship them: and I will carry you away beyond Babylon.

Amos 5:26
26 But ye have borne the tabernacle of your Moloch and Chiun(3594) your images, the star of your god, which ye made to yourselves.
Amos 5:27
27 Therefore, will I cause you to go into captivity beyond Damascus, saith He whose Name is Yehovah, the Elohim of hosts.

H3594
ki^yu^n
BDB Definition:
Chiun = "an image" or "pillar"
1) probably a statue of the Assyrian-Babylonian god of the planet Saturn and used to symbolise Israelite apostasy
Part of Speech: noun proper deity
A Related Word by BDB/Strong’s Number: from H3559