Wrangling Dates & Time in Android

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[Slide 01 - Composition of an Instant] [//]

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Current Instant

As the first thing, let’s define an Instant. To do that we can simply use the static method now. In this way, you get the current moment in time. So let’s write:

val currentInstant = Instant.now()

onz ge vim pjaff ev, xo:

println("currentInstant: $currentInstant")

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• Ko qeku weduk’l buwe.
• Jau juc kue gge kane oshef fzi L.
• Epf ax yi pene i mwukoz said lie aza xiuwl va pui e tolkov “T” ah xli uqd uz nmeycoqw. Txoy jialy ci’bo odudg wra vusuinm teju ceko naqx hni AJV zuc we 3.

Adding and Subtracting Time

Instant also provides methods to perform calculations. For example, we can add 10 hours to currentInstant. So let’s define another instance, which we call inTenHours.

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val inTenMinutes = currentInstant.plus(10, ChronoUnit.HOURS)

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Comparing two Dates

The Instant class defines other methods including isAfter. As you can imagine this function tells you what date is the most recent one. We can test this method on our previous instances. So write:

val isCurrentInstantAfterEpoch = currentInstant.isAfter(inTenHours)

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Parsing a Date and Making Calculations

Another interesting method is until. If you want to know how many days you’ve lived till now this is the method for you. First, you need to parse the date of your birthday. For this example we’ll take Marco as our case study. Marco was born on the 21 of December 2000.

val dateOfBirth = Instant.parse("2000-12-21T09:00:00.00Z")

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val daysSinceBirth = dateOfBirth.until(Instant.now(), ChronoUnit.DAYS)

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println("daysSinceBirth: $daysSinceBirth")

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