Esri date fields are represented as milliseconds from the Unix Epoch.

Usage

is_date(x,tz)date_to_ms(x, tz="UTC")from_esri_date(x)

Arguments

x

an object of classDate orPOSIXt. In the case ofis_date(), any R object.

tz

a character string. The time zone specification to be used for the conversion,if one is required. System-specific (seetime zones), but"" is the current time zone, and"GMT" is UTC (Universal Time, Coordinated). Invalid values are most commonly treated as UTC, on some platforms with a warning.

Value

• is_date() returns a logical scalar

• date_to_ms() returns a numeric vector of times in milliseconds from the Unix Epoch in the specified time zone.

Details

• is_date(): checks if an object is aDate orPOSIXt class object.

• date_to_ms() converts a date object to milliseconds from the Unix Epoch in the specified time zone.

Examples

today<-Sys.Date()is_date(today)#> [1] TRUEdate_to_ms(today)#> [1] 1.758672e+12