public static bool StartsWith(this StringReference s, string text)
{
if (text.Length > s.Length)
{
return(false);
}
var chars = s.Chars;
for (var i = 0; i < text.Length; i++)
{
if (text[i] != chars[i + s.StartIndex])
{
return(false);
}
}
return(true);
}
internal static bool TryParseDateTime(StringReference s, DateTimeZoneHandling dateTimeZoneHandling, string?dateFormatString,
CultureInfo culture, out DateTime dt
)
{
if (s.Length > 0)
{
var i = s.StartIndex;
if (s[i] == '/')
{
if (s.Length >= 9 && s.StartsWith("/Date(") && s.EndsWith(")/"))
{
if (TryParseDateTimeMicrosoft(s, dateTimeZoneHandling, out dt))
{
return(true);
}
}
}
else if (s.Length >= 19 && s.Length <= 40 && char.IsDigit(s[i]) && s[i + 10] == 'T')
{
if (TryParseDateTimeIso(s, dateTimeZoneHandling, out dt))
{
return(true);
}
}
if (!StringUtils.IsNullOrEmpty(dateFormatString))
{
if (TryParseDateTimeExact(s.ToString(), dateTimeZoneHandling, dateFormatString, culture, out dt))
{
return(true);
}
}
}
dt = default;
return(false);
}
internal static bool TryParseDateTimeIso(StringReference text, DateTimeZoneHandling dateTimeZoneHandling, out DateTime dt)
{
var dateTimeParser = new DateTimeParser();
if (!dateTimeParser.Parse(text.Chars, text.StartIndex, text.Length))
{
dt = default;
return(false);
}
var d = CreateDateTime(dateTimeParser);
long ticks;
switch (dateTimeParser.Zone)
{
case ParserTimeZone.Utc:
d = new DateTime(d.Ticks, DateTimeKind.Utc);
break;
case ParserTimeZone.LocalWestOfUtc:
{
var offset = new TimeSpan(dateTimeParser.ZoneHour, dateTimeParser.ZoneMinute, 0);
ticks = d.Ticks + offset.Ticks;
if (ticks <= DateTime.MaxValue.Ticks)
{
d = new DateTime(ticks, DateTimeKind.Utc).ToLocalTime();
}
else
{
ticks += d.GetUtcOffset().Ticks;
if (ticks > DateTime.MaxValue.Ticks)
{
ticks = DateTime.MaxValue.Ticks;
}
d = new DateTime(ticks, DateTimeKind.Local);
}
break;
}
case ParserTimeZone.LocalEastOfUtc:
{
var offset = new TimeSpan(dateTimeParser.ZoneHour, dateTimeParser.ZoneMinute, 0);
ticks = d.Ticks - offset.Ticks;
if (ticks >= DateTime.MinValue.Ticks)
{
d = new DateTime(ticks, DateTimeKind.Utc).ToLocalTime();
}
else
{
ticks += d.GetUtcOffset().Ticks;
if (ticks < DateTime.MinValue.Ticks)
{
ticks = DateTime.MinValue.Ticks;
}
d = new DateTime(ticks, DateTimeKind.Local);
}
break;
}
}
dt = EnsureDateTime(d, dateTimeZoneHandling);
return(true);
}
