Get Daylight Saving Time (DST) Switch Dates and Exact Transition Times
Source:R/daylight_saving.R
get_dst_switch_info.RdGenerate a data frame recording both the dates and exact times (hour and minute) when DST transitions occurs in the specified timezone, default is the timezone your computer is located at.
Arguments
- years
A numeric vector specifying the range of years to evaluate. Use the format
c(start_year, end_year), e.g.,years = c(2020, 2021). Must contain at least one numeric value.- tz
A valid time zone name (default is "America/Vancouver"), used to determine DST rules. Use
OlsonNames()to see all valid options.- interval
An integer (1–59) specifying the time resolution in minutes used to detect DST changes (default: 1, meaning 1 minute). You almost never need to change this.
Value
A data frame with columns:
- year
The year of DST transitions
- spring
Date when DST begins ("spring forward")
- fall
Date when DST ends ("fall back")
- spring_next_day
The day after spring DST change
- fall_next_day
The day after fall DST change
- spring_time
Exact timestamp just before DST starts
- fall_time
Exact timestamp just before DST ends
Returns an empty data frame with only column names if no transitions are found.
Details
Internally calls the internal functions dst_switch_day() to get the switch dates, and
dst_switch_hm() to detect the transition times for each spring and fall date.
If transition times cannot be detected, NA values are returned in the corresponding columns.