Converting Between AD and BS

A key feature of the bikram-sambat library is the ability to seamlessly convert between the Gregorian (AD) and Bikram Sambat (BS) calendar systems.

Converting from Bikram Sambat to Gregorian

To convert a date or datetime object from Bikram Sambat to Gregorian, use the togregorian method.

Date Conversion

from bikram_sambat import date

# Create a BS date
bs_date = date(2081, 1, 1)
print(f"Bikram Sambat Date: {bs_date}")
# >> Bikram Sambat Date: 2081-01-01

# Convert to Gregorian
ad_date = bs_date.togregorian()
print(f"Gregorian (AD) Date: {ad_date}")
# >> Gregorian (AD) Date: 2024-04-13

Datetime Conversion

from bikram_sambat import datetime, tz

# Create a BS datetime in Nepal
bs_dt = datetime(2081, 1, 1, 12, 0, 0, tzinfo=tz.nepal)
print(f"Bikram Sambat Datetime: {bs_dt}")
# >> Bikram Sambat Datetime: 2081-01-01T12:00:00+0545

# Convert to Gregorian
ad_dt = bs_dt.togregorian()
print(f"Gregorian (AD) Datetime: {ad_dt}")
# >> Gregorian (AD) Datetime: 2024-04-13 12:00:00+05:45

Converting from Gregorian to Bikram Sambat

To convert a date or datetime from Gregorian to Bikram Sambat, use the fromgregorian class method.

Date Conversion

from bikram_sambat import date
from datetime import date as ad_date

# Create a Gregorian date
gregorian_date = ad_date(2024, 4, 13)
print(f"Gregorian (AD) Date: {gregorian_date}")
# >> Gregorian (AD) Date: 2024-04-13

# Convert to Bikram Sambat
bikram_sambat_date = date.fromgregorian(gregorian_date)
print(f"Bikram Sambat Date: {bikram_sambat_date}")
# >> Bikram Sambat Date: 2081-01-01

Datetime Conversion

from bikram_sambat import datetime
from datetime import datetime as ad_datetime
import pytz

# Create a Gregorian datetime
gregorian_dt = ad_datetime(2024, 4, 13, 12, 0, 0, tzinfo=pytz.utc)
print(f"Gregorian (AD) Datetime: {gregorian_dt}")
# >> Gregorian (AD) Datetime: 2024-04-13 12:00:00+00:00

# Convert to Bikram Sambat
bikram_sambat_dt = datetime.fromgregorian(gregorian_dt)
print(f"Bikram Sambat Datetime: {bikram_sambat_dt}")
# >> Bikram Sambat Datetime: 2081-01-01T12:00:00+0000