What are SAS datetime and SAS date values?

SAS datetime is seconds since 1960-01-01T00:00:00Z (UTC) and can include fractional seconds. SAS date is whole days since 1960-01-01.

How do SAS times relate to UNIX epoch?

UNIX seconds = SAS datetime seconds − 315,619,200. SAS datetime seconds = UNIX seconds + 315,619,200. SAS date days = floor(UNIX seconds / 86400) + 3,653.

Do you support hex input?

Yes. Enter hex with or without the 0x prefix (integers). Decimals are accepted for SAS datetime seconds.

Yes. All conversions run locally in your browser; nothing is uploaded.

SAS Timestamp Converter — Datetime Seconds / Date Days since 1960 ↔ Date

SAS Timestamp Converter

Convert SAS datetime seconds or date days since 1960-01-01 UTC ↔ human-readable dates. Hex (0x…) or decimal. Fully client-side.

Display Time Zone Results always include UTC; this controls an additional local view.

Unit

Datetime (seconds) Date (days)

SAS datetime counts seconds; SAS date counts whole days.

Quick

1) SAS Value → Date

SAS number (hex like 0x12AB34 or decimal; decimals allowed for seconds) Use the Unit selector above to choose seconds vs days.

2) Date → SAS Value

Local date & time Interpreted in your current local time zone.

Or paste a date/time string If an offset is provided, it will be respected.

Output

Outputs as SAS datetime (seconds).

About SAS Time

SAS datetime counts seconds (fractional allowed) since 1960-01-01T00:00:00Z. SAS date counts whole days since 1960-01-01.

UNIX ↔ SAS datetime (seconds): unix = sasSec − 315,619,200; sasSec = unix + 315,619,200
UNIX ↔ SAS date (days): sasDays = floor(unix / 86,400) + 3,653; unix ≈ (sasDays − 3,653) × 86,400
Time zone & DST: Stored values are UTC-based; only display formatting changes with time zone/DST.

SAS Time: Code Snippets

Convert between SAS datetime seconds / date days and ISO-8601 dates.

JavaScript

const SAS_UNIX_OFFSET_SEC = 315_619_200; // 1960→1970
function unixToSasSeconds(unixSec){ return unixSec + SAS_UNIX_OFFSET_SEC; }
function sasSecondsToUnix(sasSec){ return sasSec - SAS_UNIX_OFFSET_SEC; }
function sasSecondsToDate(sasSec){ return new Date((sasSec - SAS_UNIX_OFFSET_SEC) * 1000); }
function dateToSasSeconds(d){ return d.getTime()/1000 + SAS_UNIX_OFFSET_SEC; }
function unixToSasDays(unixSec){ return Math.floor(unixSec/86400) + 3653; }
function sasDaysToUnix(sasDays){ return (sasDays - 3653) * 86400; }

Python

import datetime
SAS_UNIX_OFFSET_SEC = 315_619_200
def sas_seconds_to_datetime(s): return datetime.datetime.fromtimestamp(s - SAS_UNIX_OFFSET_SEC, tz=datetime.timezone.utc)
def datetime_to_sas_seconds(dt):
    if dt.tzinfo is None: dt = dt.astimezone()
    return dt.timestamp() + SAS_UNIX_OFFSET_SEC
def sas_days_to_date(d): # returns date at 00:00 UTC
    sec = (d - 3653) * 86400
    return datetime.datetime.fromtimestamp(sec, tz=datetime.timezone.utc)

⭐ Starlight Tools / SAS Timestamp