/
DateTimeHumanizeAlgorithms.cs
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/
DateTimeHumanizeAlgorithms.cs
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using System;
using System.Globalization;
using Humanizer.Configuration;
using Humanizer.Localisation;
namespace Humanizer.DateTimeHumanizeStrategy
{
/// <summary>
/// Algorithms used to convert distance between two dates into words.
/// </summary>
internal static class DateTimeHumanizeAlgorithms
{
/// <summary>
/// Returns localized & humanized distance of time between two dates; given a specific precision.
/// </summary>
public static string PrecisionHumanize(DateTime input, DateTime comparisonBase, double precision, CultureInfo culture)
{
var ts = new TimeSpan(Math.Abs(comparisonBase.Ticks - input.Ticks));
var tense = input > comparisonBase ? Tense.Future : Tense.Past;
return PrecisionHumanize(ts, tense, precision, culture);
}
#if NET6_0_OR_GREATER
/// <summary>
/// Returns localized & humanized distance of time between two dates; given a specific precision.
/// </summary>
public static string PrecisionHumanize(DateOnly input, DateOnly comparisonBase, double precision, CultureInfo culture)
{
var diffDays = Math.Abs(comparisonBase.DayOfYear - input.DayOfYear);
var ts = new TimeSpan(diffDays, 0, 0, 0);
var tense = input > comparisonBase ? Tense.Future : Tense.Past;
return PrecisionHumanize(ts, tense, precision, culture);
}
/// <summary>
/// Returns localized & humanized distance of time between two times; given a specific precision.
/// </summary>
public static string PrecisionHumanize(TimeOnly input, TimeOnly comparisonBase, double precision, CultureInfo culture)
{
var ts = new TimeSpan(Math.Abs(comparisonBase.Ticks - input.Ticks));
var tense = input > comparisonBase ? Tense.Future : Tense.Past;
return PrecisionHumanize(ts, tense, precision, culture);
}
#endif
private static string PrecisionHumanize(TimeSpan ts, Tense tense, double precision, CultureInfo culture)
{
int seconds = ts.Seconds, minutes = ts.Minutes, hours = ts.Hours, days = ts.Days;
int years = 0, months = 0;
// start approximate from smaller units towards bigger ones
if (ts.Milliseconds >= 999 * precision)
{
seconds += 1;
}
if (seconds >= 59 * precision)
{
minutes += 1;
}
if (minutes >= 59 * precision)
{
hours += 1;
}
if (hours >= 23 * precision)
{
days += 1;
}
// month calculation
if (days >= 30 * precision & days <= 31)
{
months = 1;
}
if (days > 31 && days < 365 * precision)
{
var factor = Convert.ToInt32(Math.Floor((double)days / 30));
var maxMonths = Convert.ToInt32(Math.Ceiling((double)days / 30));
months = (days >= 30 * (factor + precision)) ? maxMonths : maxMonths - 1;
}
// year calculation
if (days >= 365 * precision && days <= 366)
{
years = 1;
}
if (days > 365)
{
var factor = Convert.ToInt32(Math.Floor((double)days / 365));
var maxMonths = Convert.ToInt32(Math.Ceiling((double)days / 365));
years = (days >= 365 * (factor + precision)) ? maxMonths : maxMonths - 1;
}
// start computing result from larger units to smaller ones
var formatter = Configurator.GetFormatter(culture);
if (years > 0)
{
return formatter.DateHumanize(TimeUnit.Year, tense, years);
}
if (months > 0)
{
return formatter.DateHumanize(TimeUnit.Month, tense, months);
}
if (days > 0)
{
return formatter.DateHumanize(TimeUnit.Day, tense, days);
}
if (hours > 0)
{
return formatter.DateHumanize(TimeUnit.Hour, tense, hours);
}
if (minutes > 0)
{
return formatter.DateHumanize(TimeUnit.Minute, tense, minutes);
}
if (seconds > 0)
{
return formatter.DateHumanize(TimeUnit.Second, tense, seconds);
}
return formatter.DateHumanize(TimeUnit.Millisecond, tense, 0);
}
// http://stackoverflow.com/questions/11/how-do-i-calculate-relative-time
/// <summary>
/// Calculates the distance of time in words between two provided dates
/// </summary>
public static string DefaultHumanize(DateTime input, DateTime comparisonBase, CultureInfo culture)
{
var tense = input > comparisonBase ? Tense.Future : Tense.Past;
var ts = new TimeSpan(Math.Abs(comparisonBase.Ticks - input.Ticks));
var sameMonth = comparisonBase.Date.AddMonths(tense == Tense.Future ? 1 : -1) == input.Date;
var days = Math.Abs((input.Date - comparisonBase.Date).Days);
return DefaultHumanize(ts, sameMonth, days, tense, culture);
}
#if NET6_0_OR_GREATER
/// <summary>
/// Calculates the distance of time in words between two provided dates
/// </summary>
public static string DefaultHumanize(DateOnly input, DateOnly comparisonBase, CultureInfo culture)
{
var tense = input > comparisonBase ? Tense.Future : Tense.Past;
var diffDays = Math.Abs(comparisonBase.DayOfYear - input.DayOfYear);
var ts = new TimeSpan(diffDays, 0, 0, 0);
var sameMonth = comparisonBase.AddMonths(tense == Tense.Future ? 1 : -1) == input;
var days = Math.Abs(input.DayOfYear - comparisonBase.DayOfYear);
return DefaultHumanize(ts, sameMonth, days, tense, culture);
}
/// <summary>
/// Calculates the distance of time in words between two provided times
/// </summary>
public static string DefaultHumanize(TimeOnly input, TimeOnly comparisonBase, CultureInfo culture)
{
var tense = input > comparisonBase ? Tense.Future : Tense.Past;
var ts = new TimeSpan(Math.Abs(comparisonBase.Ticks - input.Ticks));
return DefaultHumanize(ts, true, 0, tense, culture);
}
#endif
private static string DefaultHumanize(TimeSpan ts, bool sameMonth, int days, Tense tense, CultureInfo culture)
{
var formatter = Configurator.GetFormatter(culture);
if (ts.TotalMilliseconds < 500)
{
return formatter.DateHumanize(TimeUnit.Millisecond, tense, 0);
}
if (ts.TotalSeconds < 60)
{
return formatter.DateHumanize(TimeUnit.Second, tense, ts.Seconds);
}
if (ts.TotalSeconds < 120)
{
return formatter.DateHumanize(TimeUnit.Minute, tense, 1);
}
if (ts.TotalMinutes < 60)
{
return formatter.DateHumanize(TimeUnit.Minute, tense, ts.Minutes);
}
if (ts.TotalMinutes < 90)
{
return formatter.DateHumanize(TimeUnit.Hour, tense, 1);
}
if (ts.TotalHours < 24)
{
return formatter.DateHumanize(TimeUnit.Hour, tense, ts.Hours);
}
if (ts.TotalHours < 48)
{
return formatter.DateHumanize(TimeUnit.Day, tense, days);
}
if (ts.TotalDays < 28)
{
return formatter.DateHumanize(TimeUnit.Day, tense, ts.Days);
}
if (ts.TotalDays >= 28 && ts.TotalDays < 30)
{
if (sameMonth)
{
return formatter.DateHumanize(TimeUnit.Month, tense, 1);
}
return formatter.DateHumanize(TimeUnit.Day, tense, ts.Days);
}
if (ts.TotalDays < 345)
{
var months = Convert.ToInt32(Math.Floor(ts.TotalDays / 29.5));
return formatter.DateHumanize(TimeUnit.Month, tense, months);
}
var years = Convert.ToInt32(Math.Floor(ts.TotalDays / 365));
if (years == 0)
{
years = 1;
}
return formatter.DateHumanize(TimeUnit.Year, tense, years);
}
}
}