Converters

Author: Taiji Yamada, Created: 07/14/2021, Last-modified: 07/14/2021

⸺ Conversion and its possible inverse conversion ⸺

Notice: According to the International System of Units (SI), a unit is not enclosed in brackets, but please note that brackets are used on this page to give priority to readability.

time ⏲️

time duration ↔︎ [ms] \(\mod 24\cdot 60\cdot 60\cdot 10^3\) \(=\) [s]

time interval ↔︎ [ms] \(\mod 24\cdot 60\cdot 60\cdot 10^3\) \(=\) [s]

date 📆️

date duration ↔︎ [ms] \(=\) [day]

date interval ↔︎ [ms] \(=\) [day]

datetime-local ⌚️

Notice: The input[type='datetime-local'] in this section is not supported by Mozilla families such as Firefox, works on Chrome, Edge, Safari and so on.

datetime duration ↔︎ [ms] \(=\)
[day] \(=\) [h] \(=\) [m] \(=\) [s]

datetime interval ↔︎ [ms] \(=\)
[day] \(=\) [h] \(=\) [m] \(=\) [s]

geographic 🧭️

coordinate

↔︎
+139.74135747 \(=\) +139°44′28.8869″

A \(\pm\) specifies the north-south position for Latitude (緯度) and the east–west position for Longitude (経度).

units ⚛️

length 📏️

The definitions of units in this section are as follows. Others are by SI and other definitions.

ly: light-year, a unit of length. 光年
Ss: upper-bound sound second, a unit of length expresses 36100 [m]. 音速の上限×秒
ss: sonic second, a unit of length expresses 1224/3600 [km] = 340 [m]. 音速×秒

length	ly	Ss	Nm	mil	km	ss	m	yd	ft	in	cm	cc	nc	pc	mm	dd	nd	bp	pt	μm	sp	nm	Å	pm
	[c]

Set the value of one of the cells to zero to reset.

velocity 🚅️

The definitions of units in this section are as follows. Others are by SI and other definitions.

ly: light-year, a unit of length. 光年
Jy: Julian year, a unit of time expresses 31557600 [s]. ユリウス年
c: light speed, a unit of velocity expresses 299792458 [m/s]. 光速
Ss: upper-bound sound second, a unit of length expresses 36100 [m]. 音速の上限×秒
ss: sonic second, a unit of length expresses 1224/3600 [km] = 340 [m]. 音速×秒
mach: sonic speed, a unit of velocity expresses 1224 [km/h] = 340 [m/s]. 音速

time⧵length	ly	mil	ss	m	ft
Jy	[c]
h		[kt]		[mph]
min					[fpm]
s			[mach]

Set the value of one of the cells to zero to reset.

angle 📐️

The definitions of units in this section are as follows. Others are by SI and other definitions.

r: rotations around a fixed axis expresses 2π [rad].

angle	r	rad	°	gon

Set the value of one of the cells to zero to reset.

angular velocity ⚙️

time⧵angle	r	rad	°	gon
h	[rph]
min	[rpm]
s	[Hz][rps]

Set the value of one of the cells to zero to reset.

temperature 🌡️

The definitions of units in this section are as follows.

K: the kelvin scale is the base unit of temperature in the SI.
0 [℃] = 273.15 [K], 100 [℃] = 373.15 [K].
℃: the Celsius scale is a unit of temperature.
℉: The Fahrenheit scale is a unit of temperature.
0 [℃] = 32 [℉], 100 [℃] = 212 [℉].
°R: The Rankine scale is an absolute scale of temperature.
0 [℃] = 491.67 [°R], 100 [℃] = 671.67 [°R].
°D: The Delisle scale is a unit of temperature.
0 [℃] = 150 [°D], 100 [℃] = 0 [°D].
°N: The Newton scale is a unit of temperature.
0 [℃] = 0 [°N], 100 [℃] = 33 [°N].
°Ré: The Réaumur scale is a unit of temperature.
0 [℃] = 0 [°Ré], 100 [℃] = 80 [°Ré].
°Rø: The Rømer scale is a unit of temperature.
0 [℃] = 7.5 [°Rø], 100 [℃] = 60 [°Rø].

temperature	K	℃	℉	°R	°D	°N	°Ré	°Rø

… to be continued.

When we need a conversion, we rarely need its inverse, but by always thinking about it we make new discoveries, rarely.

変換を必要とするとき、その逆変換が必要になることは稀だが、逆変換を常に考えることで新たな発見をすることが、稀にある。

Written by Taiji Yamada.