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DateHelper
  • April 23, 2024

A high performant Swift Date Extension for creating, comparing, or modifying dates.

Capabilities

  • Date from String
    • Using date detection i.e. "Tomorrow at 5:30 PM"
    • With predefined format: i.e. .isoDateTime
    • With custom format: i.e. "dd MMM yyyy HH:mm:ss"
  • String from Date
    • With predefined format: i.e. .rss
    • With custom format: i.e. ""MMM d, yyyy""
    • With combined date and time style: i.e. .medium
    • With individual date and time style: i.e. .medium, .short
  • Modify Date
    • Offset date component: i.e. .offset(.second, value: 110)
    • Adjust date component: i.e. .adjust(hour: 12, minute: 0, second: 0)
    • Adjust date to a predefined time: i.e. .adjust(for: .startOfDay)
  • Compare Date
    • Compare against relative date in predefined format: i.e. .isToday, .isThisWeek
    • Compare againnst target date: i.e. firstDate.compare(.isSameMonth(as: secondDate))
  • Time Since
    • Time since target date in component: i.e. Date().since(secondDate, in: .second)
  • Extras
    • Extract date and time components: i.e. .hour, .minute, .day
    • Conveniance methods: i.e. numberOfDaysInMonth(), firstDayOfWeek(), .lastDayOfWeek()

Date From String

Provides initializers to create a Date from a String

Detect a Date from natural language in a String

Date(detectFromString: “Tomorrow at 5:30 PM”)

Uses NSDataDetector to detect a date from natural language in a string. It works similar to how Apple Mail detects dates. This initializer is not as efficient as fromString:format: and should not be used in collections or lists.

Date from a string with predefined format

Date(fromString: “2009”, format: .isoYear)
Date(fromString: “2009-08”, format: .isoYearMonth)
Date(fromString: “2009-08-11”, format: .isoDate)
Date(fromString: “2009-08-11T06:00:00-07:00”, format: .isoDateTime)
Date(fromString: “2009-08-11T06:00:00.000-07:00”, format: .isoDateTimeFull)
Date(fromString: “/Date(1260123281843)/”, format: .dotNet)
Date(fromString: “Fri, 09 Sep 2011 15:26:08 +0200”, format: .rss)
Date(fromString: “09 Sep 2011 15:26:08 +0200”, format: .altRSS)
Date(fromString: “Wed, 01 03 2017 06:43:19 -0500”, format: .httpHeader)

Highly performant, cached and thread safe. Can optionally receive timeZone, locale or isLenient flag.

Date from a string with custom format

Date(fromString: “16 July 1972 6:12:00”, format: .custom(“dd MMM yyyy HH:mm:ss”))

Highly performant, cached and thread safe. Can optionally receive timeZone, locale or isLenient flag.

String From Date

Provides three ways to convert a Date object to a String

Convert Date to String using predefined format

Date().toString(format: .isoYear)
“2017”
Date().toString(format: .isoYearMonth)
“2017-03”
Date().toString(format: .isoDate)
“2017-03-01”
Date().toString(format: .isoDateTime)
“2017-03-01T06:43:19-05:00”
Date().toString(format: .isoDateTimeFull)
“2017-03-01T06:43:19.000-05:00”
Date().toString(format: .dotNet)
“/Date(-51488368599000.000000)/”
Date().toString(format: .rss)
“Wed, 1 Mar 2017 06:43:19 -0500”
Date().toString(format: .altRSS)
“1 Mar 2017 06:43:19 -0500”
Date().toString(format: .httpHeader)
“Wed, 01 03 2017 06:43:19 -0500”

Highly performant, cached and thread safe. Can optionally receive timeZone and locale.

Convert Date to String using custom format

Date().toString(format: .custom(“MMM d, yyyy”))
“Mar 1, 2017”
Date().toString(format: .custom(“h:mm a”))
“6:43 AM”
Date().toString(format: .custom(“MMM d”))
“Wed Mar 1”

Highly performant, cached and thread safe. Can optionally receive timeZone and locale.

Convert Date to String using predefined combined date and time styles

Date().toString(format: .custom(“MMM d, yyyy”))
“Mar 1, 2017”
Date().toString(format: .custom(“h:mm a”))
“6:43 AM”
Date().toString(format: .custom(“MMM d”))
“Wed Mar 1”

Highly performant, cached and thread safe. Can optionally receive timeZone and locale.

Convert Date to String using predefined combined date and time styles

Date().toString(style: .short)
“3/1/17, 6:43 AM”
Date().toString(style: .medium)
“Mar 1, 2017 at 6:43:19 AM”
Date().toString(style: .long)
“March 1, 2017 at 6:43:19 AM EST”
Date().toString(style: .full)
“Wednesday, March 1, 2017 at 6:43:19 AM Eastern Standard Time”
Date().toString(style: .ordinalDay)
“1st”
Date().toString(style: .weekday)
“Wednesday”
Date().toString(style: .shortWeekday)
“Wed”
Date().toString(style: .veryShortWeekday)
“W”
Date().toString(style: .month)
“April”
Date().toString(style: .shortMonth)
“Apr”
Date().toString(style: .veryShortMonth)
“A”

Convert Date to String using predefined individual date and time styles

Date().toString(dateStyle: .none, timeStyle: .short)
“6:43 AM”
Date().toString(dateStyle: .short, timeStyle: .none)
“3/1/17”
Date().toString(dateStyle: .short, timeStyle: .short)
“3/1/17, 6:43 AM”
Date().toString(dateStyle: .medium, timeStyle: .medium)
“Mar 1, 2017 at 6:43:19 AM”
Date().toString(dateStyle: .long, timeStyle: .long)
“March 1, 2017 at 6:43:19 AM EST”
Date().toString(dateStyle: .full, timeStyle: .full)
“Wednesday, March 1, 2017 at 6:43:19 AM Eastern Standard Time”

Modifying dates

Provides functions for adjusting or shifting dates

Offset components

Date().offset(.second, value: 10)
“18:14:41” -> “18:14:51”
Date().offset(.minute, value: 10)
“18:14:41” -> “18:24:41”
Date().offset(.hour, value: 2)
“18:14:41” -> “20:14:41”
Date().offset(.day, value: 1)
“2009-12-06” -> “2009-12-07”
Date().offset(.weekday, value: 2)
“2009-12-06” -> “2009-16-06”
Date().offset(.weekdayOrdinal, value: 1)
“2009-12-06” -> “2009-12-20”
Date().offset(.week, value: -2)
“2009-12-06” -> “2009-11-22”
Date().offset(.month, value: 2)
“2009-12-06” -> “2010-02-06”
Date().offset(.year, value: -2)
“2009-12-06” -> “2007-12-06”

Adjust components

Modifies date with the specified date component

Date().adjust(hour: 1, minute: 10, second: 30, day: 15, month: 1)
“2009-12-06 18:14:41” -> “2009-01-15 06:10:30”
Date().adjust(minute: 59)
“2009-12-06 18:14:41” -> “2009-12-06 18:59:30”

Adjust date

Modifies date with predefined times like endOfDay, startOfDay startOfWeek etc.

Date().adjust(for: .startOfDay)
“2009-12-06 18:14:41” -> “2009-12-06 00:00:00”
Date().adjust(for: .endOfDay)
“2009-12-06 18:14:41” -> “2009-12-06 23-59-59”
Date().adjust(for: .startOfWeek)
“2009-12-08 18:14:41” -> “2009-12-06 18:14:41”
Date().adjust(for: .endOfWeek)
“2009-12-06 18:14:41” -> “2009-12-12 18:14:41”
Date().adjust(for: .startOfMonth)
“2009-12-06 18:14:41” -> “2009-12-01 18:14:41”
Date().adjust(for: .endOfMonth)
“2009-12-06 18:14:41” -> “2009-12-31 18:14:41”
Date().adjust(for: .tomorrow)
“2009-12-06 18:14:41” -> “tomorrow at 18:14:41”
Date().adjust(for: .yesterday)
“2009-12-06 18:14:41” -> “yesterday at 18:14:41”
Date().adjust(for: .nearestMinute(minute:30))
“2009-12-07 18-14-00” -> “2009-12-07 18-00-00”
“2009-12-07 18-40-00” -> “2009-12-07 18-30-00”
“2009-12-07 18-50-00” -> “2009-12-07 19-00-00”
Date().adjust(for: .nearestHour(hour:2))
“2009-12-07 18-00-00” -> “2009-12-08 00-00-00”
“2009-12-07 07-00-00” -> “2009-12-07 12-00-00”
“2009-12-07 03-00-00” -> “2009-12-07 00-00-00”
Date().adjust(for: .startOfYear)
“2009-12-06 18:14:41” -> “2009-01-01 00-00-00”
Date().adjust(for: .endOfYear)
“2009-12-06 18:14:41” -> “2009-12-31 23-59-59”

Compare Dates

Compares dates using predefined times like today, tomorrow, this year, next year etc. Returns true if it matches.

Compare against relative date

Date().compare(.isToday)
Date().compare(.isTomorrow)
Date().compare(.isYesterday)
Date().compare(.isThisWeek)
Date().compare(.isNextWeek)
Date().compare(.isLastWeek)
Date().compare(.isThisYear)
Date().compare(.isNextYear)
Date().compare(.isLastYear)
Date().compare(.isInTheFuture)
Date().compare(.isInThePast)
Date().compare(.isWeekend)
“2021-12-15” != weekend
“2021-12-18” == weekend

Compare against another date

firstDate.compare(.isSameDay(as: secondDate))
“2022-01-08” != “2022-01-07”
“2022-01-06” != “2022-01-07”
“2022-01-07” == “2022-01-07”
firstDate.compare(.isSameWeek(as: secondDate))
“2022-01-14” != “2022-01-07”
“2021-12-31” != “2022-01-07”
“2022-01-07” == “2022-01-07”
firstDate.compare(.isSameMonth(as: secondDate))
“2022-02-07” != “2022-01-07”
“2021-12-07” != “2022-01-07”
“2022-01-07” == “2022-01-07”
firstDate.compare(.isSameYear(as: secondDate))
“2023-01-07” != “2022-01-07”
“2021-01-07” != “2022-01-07”
“2022-01-07” == “2022-01-07”
firstDate.compare(.isEarlier(than: secondDate))
“2022-01-07 19:26:53” != “2022-01-07 19:25:53”
“2022-01-07 19:24:53” == “2022-01-07 19:25:53”
firstDate.compare(.isLater(than: secondDate))
“2022-01-07 19:28:49” == “2022-01-07 19:27:49”
“2022-01-07 19:26:49” != “2022-01-07 19:27:49”

Time since…

Returns a number in the specified unit of measure since the secondary date.

Date().since(secondDate, in: .second)
“2009-12-06 06-14-11” since “2009-12-06 06-13-41” in .second == 30
Date().since(secondDate, in: .minute)
“2009-12-06 06-14-11” since “2009-12-06 04-14-11” in .minute == 120
Date().since(secondDate, in: .hour)
“2009-12-06 06-14-11” since “2009-12-06 04-14-11” in .hour == 2
Date().since(secondDate, in: .day)
“2009-12-06” since “2009-12-05” in .day == 1
Date().since(secondDate, in: .week)
“2009-12-06” since “2009-11-29” in .week == 1
“2009-12-06” since “2009-12-13” in .week == -1
Date().since(secondDate, in: .weekdayOrdinal)
“2009-12-06” since “2009-11-22” in .weekdayOrdinal == 2
Date().since(secondDate, in: .month)
“2009-12-06” since “2009-11-06” in .month == 2
Date().since(secondDate, in: .year)
“2009-12-06” since “2008-12-06” in .year == 1

Miscellaneous

Extracting components from a date

Date().component(.second)
“2009-12-06 18:14:11” .second == “11”
Date().component(.minute)
“2009-12-06 18:14:11” .minute == “14”
Date().component(.hour)
“2009-12-06 18:14:11” .hour == “18”
Date().component(.day)
“2009-12-06 18:14:11” .day == “6”
Date().component(.weekday)
“2009-12-06 18:14:11” .weekday == “1”
Date().component(.weekdayOrdinal)
“2009-12-06 18:14:11” .weekdayOrdinal == “1”
Date().component(.month)
“2009-12-06 18:14:11” .month == “12”
Date().component(.year)
“2009-12-06 18:14:11” .year == “2009”

Conveneience methods

Date().numberOfDaysInMonth()
“2021-12-17” numberOfDaysInMonth() == 31
Date().firstDayOfWeek()
“2021-12-17” firstDayOfWeek() == 12
Date().lastDayOfWeek()
“2021-12-17” lastDayOfWeek() == 19

Custom start day of the week

var calendar = Calendar(identifier: .gregorian)
calendar.firstWeekday = 2 // sets the week to start on Monday
Date().dateFor(.startOfWeek, calendar: calendar)

Custom Component guide

Unicode Date Field Symbol Guide

Format Description Example
“y” 1 digit min year 1, 42, 2017
“yy” 2 digit year 01, 42, 17
“yyy” 3 digit min year 001, 042, 2017
“yyyy” 4 digit min year 0001, 0042, 2017
“M” 1 digit min month 7, 12
“MM” 2 digit month 07, 12
“MMM” 3 letter month abbr. Jul, Dec
“MMMM” Full month July, December
“MMMMM” 1 letter month abbr. J, D
“d” 1 digit min day 4, 25
“dd” 2 digit day 04, 25
“E”, “EE”, “EEE” 3 letter day name abbr. Wed, Thu
“EEEE” full day name Wednesday, Thursday
“EEEEE” 1 letter day name abbr. W, T
“EEEEEE” 2 letter day name abbr. We, Th
“a” Period of day AM, PM
“h” AM/PM 1 digit min hour 5, 7
“hh” AM/PM 2 digit hour 05, 07
“H” 24 hr 1 digit min hour 17, 7
“HH” 24 hr 2 digit hour 17, 07
“m” 1 digit min minute 1, 40
“mm” 2 digit minute 01, 40
“s” 1 digit min second 1, 40
“ss” 2 digit second 01, 40
“S” 10th’s place of fractional second 123ms -> 1, 7ms -> 0
“SS” 10th’s & 100th’s place of fractional second 123ms -> 12, 7ms -> 00
“SSS” 10th’s & 100th’s & 1,000’s place of fractional second 123ms -> 123, 7ms -> 007

Requirements

Language: Swift 5.0 Supports: iOS, tvOS, watchOS, macOS

GitHub

View Github

#date #date-formatting #date-time #datepicker
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