Unit Grijjy.DateUtils
Description
System level date/time utilities
Overview
Functions and Procedures
Constants
Description
Functions and Procedures
function goDateTimeToMillisecondsSinceEpoch(const AValue: TDateTime; const AInputIsUTC: Boolean): Int64; |
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Converts a date/time value to a number of milliseconds since the Unix epoch.
Parameters
- AValue
- the date/time value to convert.
- AInputIsUTC
- whether AValue is in UTC format.
Returns
The number of milliseconds since the Unix epoch. |
function goToDateTimeFromMillisecondsSinceEpoch(const AValue: Int64; const AReturnUTC: Boolean): TDateTime; |
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Converts a number of milliseconds since the Unix epoch to a date/time value.
Parameters
- AValue
- number of milliseconds since the Unix epoch.
- AReturnUTC
- whether to return the corresponding date/time value in local time (False) or universal time (True).
Returns
The date/time value. Exceptions raised
EArgumentOutOfRangeException- if AValue cannot be accurately converted to a date/time value
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function goDateTimeToTicks(const AValue: TDateTime; const AInputIsUTC: Boolean): Int64; |
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Converts a date/time value to a number of ticks that has passed since midnight, January 1, 0001 UTC.
There are 10,000 ticks in a milliseconds (or 10 million ticks in a second).
Parameters
- AValue
- the date/time value to convert.
- AInputIsUTC
- whether AValue is in UTC format.
Returns
The number of ticks. |
function goDateTimeFromTicks(const AValue: Int64; const AReturnUTC: Boolean): TDateTime; |
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Converts a number of ticks that has passed since midnight, January 1, 0001 UTC to a date/time value.
There are 10,000 ticks in a milliseconds (or 10 million ticks in a second).
Parameters
- AValue
- the number of ticks.
- AReturnUTC
- whether to return the corresponding date/time value in local time (False) or universal time (True).
Returns
The date/time value. |
Constants
MIN_MILLISECONDS_SINCE_EPOCH = -62135596800000; |
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The minimum and maximum number of milliseconds since the Unix epoch that we can use to convert to and from a TDateTime value without loss in precision. Note that Delphi's TDateTime type can safely handle a larger range of milliseconds, but other languages may not.
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MAX_MILLISECONDS_SINCE_EPOCH = 253402300799999; |
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