Over 2 decades of experience on the Web…
Public
Edited
Feb 1, 2023
Importers
9 stars
new Date("2022-09-11") + "" === new Date("2022/09/11") + ""
new Date("2022-09-11") + "" === new Date(2022, 9, 11) + "" // expected output: false (months are 0-indexed)
new Date("+0000-00-00T00:00Z")
date("2022-09-11") + "" === date("2022/09/11") + ""
date("2022-09-11") + "" === date(2022, 9, 11) + "" // expected output: true (months are 1-indexed)
date("+0000-00-00T00:00Z")
+date()
+date(date())
date(1996, 19, 96, 19, 96, 1996).toISOString()
+date(undefined)
+date(void 0)
date(null)
date(0)
date(/* string */ new Date().getFullYear() + "")
date(/* number */ new Date().getFullYear()) // timestamp value!
date(new Date().getFullYear(), null)
date(new Date().getFullYear(), 0)
date("2022-9-0")
date("2022/9/0")
date("2022 9 0")
date("2022, 9, 0")
date(0, 0, 0).toISOString()
date(0, 0, 0).toISOString() === date(0, 0).toISOString()
date("2022-9--1")
date(2022, 9, -30)
date(2022, 8, 0)
date("2022/8")
date(2022, 8)
date(2022, 9, -30) + "" === date(2022, 8, 0) + "" // expected output: true
date(2022, 8) + "" === date(2022, 8, 0) + "" // expected output: false
date("2022-09-10#24:00") + "" === date("2022-09-11#00:00") + "" // expected output: true
date("2022-032").toISOString() === date("2022-02-01").toISOString() // expected output: true
date("2022-2022").toISOString() === date(2022, 0, 2022).toISOString() // expected output: true
range = [+date("1970/-99999999"), +date("1970/100000001")]
date("1900/-693960")
date("2022-032T20:22").toISOString() === date("2022-02-01T20:22").toISOString() // expected output: true
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("0-1-1#-24:00")) // WARNING: this is *NOT* a time zone offset!
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("0-1-1#0+24:00"))
date("0-1-1#+24:00").toISOString() === date("0-1-1#0+24:00").toISOString() // expected output: false
date("0-1-1#0+24:00").toISOString() ===
new Date("-000001-12-31T23:59+23:59").toISOString() // expected output: true
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("0-1-1#+24:00")) // WARNING: this is *NOT* a time zone offset!
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("0-1-1#0-24:00"))
date("0-1-1#-24:00").toISOString() === date("0-1-1#0-24:00").toISOString() // expected output: false
date("0-1-1#0-24:00").toISOString() ===
new Date("+000000-01-01T00:01-23:59").toISOString() // expected output: true
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("TZ")) // Coordinated Universal Time
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("TJ")) // local time
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date("1970-1-1#20:22:2.22")
) // Coordinated Universal Time
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date("1970-1-1#20:22:2.22J")
) // local time
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date(2022, 9, 11, 20, 22, 0, 2022)
)
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date("2022-09-11T22:22:02.022+02:00")
)
date([
/* YYYY-MM-DD */ "2022-22-20",
/* HH:mm:ss.sss w/o Z suffix or time zone offset */ "22:20:02.022"
])
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date([
/* YYYY-MM-DD */ "2022-22-20",
/* HH:mm:ss.sss w/ positive time zone offset */ "22:20:02.022+20:22"
])
)
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date([
/* YYYY-MM-DD */ "2022-22-20",
/* HH:mm:ss.sss w/ negative time zone offset */ "22:20:02.022-20:22"
])
)
date(["2022", "20:22:02.22"])
date(["2022-032", "20:22:02.022Z"])
date([
/* array can be empty */
])
date([0])
date([0, 0])
date(["0, 0"]) // note the subtle difference
date(["0/0/0", 0])
date(["0000-01-01", "00:00+20:22"]).toISOString() ===
new Date("+000000-01-01T00:00+20:22").toISOString() // expected output: true
date(["0000-01-01", "00:00-20:22"]).toISOString() ===
new Date("+000000-01-01T00:00-20:22").toISOString() // expected output: true
+date(1970, 0, -100000000, 24)
date(1970, 0, -100000000, 24).toISOString()
date(1970, 1, -100000000 - 30).toISOString()
date(1970, 1, 100000000 + 1).toISOString()
date(1970, 0, +100000000, 24).toISOString()
+date(1970, 0, +100000000, 24)
date(1970, 0, -100000000 + 1) + "" === date(1970, 1, -100000000 - 30) + "" // expected output: true
-1 * +date("1970/-99999999") === +date("1970/100000001") // expected output: true
datediff("1970/-99999999", 0)
datediff("1970/100000001", 0)
date(0).toISOString() === date(0, 0).toISOString() // expected output: false
date([0]).toISOString() === date([1970, 0]).toISOString() // expected output: true
date(0).toISOString() === date("1970").toISOString() // expected output: true
+date(0)
+date(0, 0)
+date("1970")
datediff(0)
datediff(null, 0)
datediff(void 0, 0)
datediff(0, 0)
datediff(new Date(Date.UTC(0, 0, -693960)), new Date(Date.UTC(0, 0, 0)))
datediff("+1970-01-01T0+24:59" /* this is a time zone offset */, 0)
datediff("+1970-01-01T-24:59" /* this is *NOT* a time zone offset! */, 0)
datediff("+1970-01-01T+24:59" /* this is *NOT* a time zone offset! */, 0)
datediff("+1970-01-01T0-24:59" /* this is a time zone offset */, 0)
datediff("+1970-01-01T-48", 0)
datediff("+1970-01-01T+48", 0)
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("1970-1-1TY"))
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date("1970-1-1#0" + letter2offset("Yankee"))
)
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date("1970-1-1#0" + letter2offset("Juliett"))
)
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(
date("1970-1-1#0" + letter2offset("Mike"))
)
((dt) => [dt.toISOString(), [dt?.offset, +dt?.offset]])(date("1970-1-1TM"))
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.